diff --git a/.github/workflows/ci-rust.yml b/.github/workflows/ci-rust.yml
index 138de166bf..e6103535e3 100644
--- a/.github/workflows/ci-rust.yml
+++ b/.github/workflows/ci-rust.yml
@@ -111,6 +111,8 @@ jobs:
     # send the code coverage for the Rust part to the coveralls.io
     - name: Coveralls GitHub Action
       uses: coverallsapp/github-action@v2
+      # ignore errors in this step
+      continue-on-error: true
       with:
         base-path: ./rust
         format: cobertura
@@ -122,6 +124,8 @@ jobs:
     # only with the "parallel-finished: true" option)
     - name: Coveralls Finished
       uses: coverallsapp/github-action@v2
+      # ignore errors in this step
+      continue-on-error: true
       with:
         parallel-finished: true
         carryforward: "service,web"
diff --git a/rust/agama-lib/src/product/client.rs b/rust/agama-lib/src/product/client.rs
index 16b71740f6..45769fd109 100644
--- a/rust/agama-lib/src/product/client.rs
+++ b/rust/agama-lib/src/product/client.rs
@@ -135,7 +135,11 @@ impl<'a> ProductClient<'a> {
             .into_iter()
             .map(|(id, version, code)| AddonParams {
                 id,
-                version,
+                version: if version.is_empty() {
+                    None
+                } else {
+                    Some(version)
+                },
                 registration_code: if code.is_empty() { None } else { Some(code) },
             })
             .collect();
@@ -158,7 +162,7 @@ impl<'a> ProductClient<'a> {
             .registration_proxy
             .register_addon(
                 &addon.id,
-                &addon.version,
+                &addon.version.clone().unwrap_or_default(),
                 &addon.registration_code.clone().unwrap_or_default(),
             )
             .await?)
diff --git a/rust/agama-lib/src/product/settings.rs b/rust/agama-lib/src/product/settings.rs
index 28bf0f3cb8..c0eed23eac 100644
--- a/rust/agama-lib/src/product/settings.rs
+++ b/rust/agama-lib/src/product/settings.rs
@@ -27,7 +27,12 @@ use serde::{Deserialize, Serialize};
 #[serde(rename_all = "camelCase")]
 pub struct AddonSettings {
     pub id: String,
-    pub version: String,
+    /// Optional version of the addon, if not specified the version is found
+    /// from the available addons
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub version: Option<String>,
+    /// Free extensions do not require a registration code
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub registration_code: Option<String>,
 }
 
diff --git a/rust/agama-lib/src/software/model/registration.rs b/rust/agama-lib/src/software/model/registration.rs
index 28e711f7b6..d4adf2537e 100644
--- a/rust/agama-lib/src/software/model/registration.rs
+++ b/rust/agama-lib/src/software/model/registration.rs
@@ -35,8 +35,8 @@ pub struct RegistrationParams {
 pub struct AddonParams {
     // Addon identifier
     pub id: String,
-    // Addon version, the same addon might be available in multiple versions
-    pub version: String,
+    // Addon version, if not specified the version is found from the available addons
+    pub version: Option<String>,
     // Optional registration code, not required for free extensions
     pub registration_code: Option<String>,
 }
diff --git a/rust/package/agama.changes b/rust/package/agama.changes
index d832727d4b..72f0888aaf 100644
--- a/rust/package/agama.changes
+++ b/rust/package/agama.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Apr  1 12:44:57 UTC 2025 - Ladislav Slezák <lslezak@suse.com>
+
+- Make the extension version attribute optional, search the version
+  automatically if it is missing (related to jsc#AGM-100)
+
 -------------------------------------------------------------------
 Fri Mar 28 21:45:05 UTC 2025 - Josef Reidinger <jreidinger@suse.com>
 
diff --git a/service/lib/agama/autoyast/product_reader.rb b/service/lib/agama/autoyast/product_reader.rb
index 90fcc0b637..24b0021251 100755
--- a/service/lib/agama/autoyast/product_reader.rb
+++ b/service/lib/agama/autoyast/product_reader.rb
@@ -83,9 +83,16 @@ def from_suse_register(section)
       # convert addons according to the new schema
       def convert_addons(addons)
         addons.map do |a|
-          addon = { "id" => a["name"], "version" => a["version"] }
+          addon = { "id" => a["name"] }
+
+          version = a["version"].to_s
+          # omit the version if it was 11.x, 12.x or 15.x, the version is now optional
+          version = "" if version.match(/^1[125]\.\d$/)
+          addon["version"] = version unless version.empty?
+
           code = a["reg_code"].to_s
           addon["registrationCode"] = code unless code.empty?
+
           addon
         end
       end
diff --git a/service/lib/agama/dbus/software/product.rb b/service/lib/agama/dbus/software/product.rb
index 843200fa1b..ae1176b762 100644
--- a/service/lib/agama/dbus/software/product.rb
+++ b/service/lib/agama/dbus/software/product.rb
@@ -24,6 +24,7 @@
 require "agama/dbus/base_object"
 require "agama/dbus/interfaces/issues"
 require "agama/dbus/clients/locale"
+require "agama/errors"
 require "agama/registration"
 
 module Agama
@@ -143,7 +144,8 @@ def registered_addons
           backend.registration.registered_addons.map do |addon|
             [
               addon.name,
-              addon.version,
+              # return empty string if the version was not explicitly specified (was autodetected)
+              addon.required_version ? addon.version : "",
               addon.reg_code
             ]
           end
@@ -199,7 +201,8 @@ def register(reg_code, email: nil)
         #   have to explicitly call to #Probe after registering a product.
         #
         # @param name [String] name (id) of the addon, e.g. "sle-ha"
-        # @param version [String] version of the addon, e.g. "16.0"
+        # @param version [String] version of the addon, e.g. "16.0", if empty the version is found
+        #   automatically in the list of available addons
         # @param reg_code [String] registration code, if the code is not required for the addon use
         # an empty string ("")
         #
@@ -216,6 +219,8 @@ def register(reg_code, email: nil)
         #   8: incorrect credentials
         #   9: invalid certificate
         #   10: internal error (e.g., parsing json data)
+        #   11: addon not found
+        #   12: addon found in multiple versions
         def register_addon(name, version, reg_code)
           if !backend.product
             [1, "Product not selected yet"]
@@ -335,6 +340,10 @@ def connect_result(first_error_code: 1, &block)
           connect_result_from_error(e, first_error_code + 5, "invalid certificate")
         rescue JSON::ParserError => e
           connect_result_from_error(e, first_error_code + 6)
+        rescue Errors::Registration::ExtensionNotFound => e
+          connect_result_from_error(e, first_error_code + 7)
+        rescue Errors::Registration::MultipleExtensionsFound => e
+          connect_result_from_error(e, first_error_code + 8)
         end
 
         # Generates a result from a given error.
diff --git a/service/lib/agama/errors.rb b/service/lib/agama/errors.rb
index db6a1915fa..8fb2d21959 100644
--- a/service/lib/agama/errors.rb
+++ b/service/lib/agama/errors.rb
@@ -24,5 +24,22 @@ module Agama
   module Errors
     # Invalid value given by the user
     class InvalidValue < StandardError; end
+
+    # Registration specific errors
+    module Registration
+      # The requested extension was not found
+      class ExtensionNotFound < StandardError
+        def initialize(name)
+          super("#{name.inspect} is not available")
+        end
+      end
+
+      # The requested extension exists in multiple versions
+      class MultipleExtensionsFound < StandardError
+        def initialize(name, versions)
+          super("#{name.inspect} is available in multiple versions: #{versions.join(", ")}")
+        end
+      end
+    end
   end
 end
diff --git a/service/lib/agama/registered_addon.rb b/service/lib/agama/registered_addon.rb
index f07fdb1e80..65622b1552 100644
--- a/service/lib/agama/registered_addon.rb
+++ b/service/lib/agama/registered_addon.rb
@@ -32,14 +32,20 @@ class RegisteredAddon
     # @return [String]
     attr_reader :version
 
+    # The addon version was explicitly specified by the user or it was autodetected.
+    #
+    # @return [Boolean] true if explicitly specified by user, false when autodetected
+    attr_reader :required_version
+
     # Code used for registering the addon.
     #
     # @return [String] empty string if the registration code is not required
     attr_reader :reg_code
 
-    def initialize(name, version, reg_code = "")
+    def initialize(name, version, required_version, reg_code = "")
       @name = name
       @version = version
+      @required_version = required_version
       @reg_code = reg_code
     end
   end
diff --git a/service/lib/agama/registration.rb b/service/lib/agama/registration.rb
index 5afe358074..0b67a08c47 100644
--- a/service/lib/agama/registration.rb
+++ b/service/lib/agama/registration.rb
@@ -27,6 +27,7 @@
 require "y2packager/resolvable"
 
 require "agama/cmdline_args"
+require "agama/errors"
 require "agama/registered_addon"
 
 Yast.import "Arch"
@@ -90,13 +91,8 @@ def register(code, email: "")
       # TODO: check if we can do it in memory for libzypp
       SUSE::Connect::YaST.create_credentials_file(@login, @password, GLOBAL_CREDENTIALS_PATH)
 
-      target_product = OpenStruct.new(
-        arch:       Yast::Arch.rpm_arch,
-        identifier: product.id,
-        version:    product.version || "1.0"
-      )
       activate_params = {}
-      service = SUSE::Connect::YaST.activate_product(target_product, activate_params, email)
+      service = SUSE::Connect::YaST.activate_product(base_target_product, activate_params, email)
       process_service(service)
 
       @reg_code = code
@@ -105,25 +101,33 @@ def register(code, email: "")
     end
 
     def register_addon(name, version, code)
-      if @registered_addons.any? { |a| a.name == name && a.version == version }
-        @logger.info "Addon #{name}-#{version} already registered, skipping registration"
+      register_version = if version.empty?
+        # version is not specified, find it automatically
+        find_addon_version(name)
+      else
+        # use the explicitly required version
+        version
+      end
+
+      if @registered_addons.any? { |a| a.name == name && a.version == register_version }
+        @logger.info "Addon #{name}-#{register_version} already registered, skipping registration"
         return
       end
 
-      @logger.info "Registering addon #{name}-#{version}"
+      @logger.info "Registering addon #{name}-#{register_version}"
       # do not log the code, but at least log if it is empty
       @logger.info "Using empty registration code" if code.empty?
 
       target_product = OpenStruct.new(
         arch:       Yast::Arch.rpm_arch,
         identifier: name,
-        version:    version
+        version:    register_version
       )
       activate_params = { token: code }
       service = SUSE::Connect::YaST.activate_product(target_product, activate_params, @email)
       process_service(service)
 
-      @registered_addons << RegisteredAddon.new(name, version, code)
+      @registered_addons << RegisteredAddon.new(name, register_version, !version.empty?, code)
       # select the products to install
       @software.addon_products(find_addon_products)
 
@@ -150,6 +154,7 @@ def deregister
       # reset
       @software.addon_products([])
       @services = []
+      @available_addons = nil
 
       reg_params = connect_params(token: reg_code, email: email)
       SUSE::Connect::YaST.deactivate_system(reg_params)
@@ -314,5 +319,47 @@ def repository_data(repo)
       data["SrcId"] = repo
       data
     end
+
+    # Get the available addons for the specified base product.
+    #
+    # @note The result is bound to the registration code used for the base product, the result
+    # might be different for different codes. E.g. the Alpha/Beta extensions might or might not
+    # be included in the list.
+    def available_addons
+      return @available_addons if @available_addons
+
+      @available_addons = SUSE::Connect::YaST.show_product(base_target_product,
+        connect_params).extensions
+      @logger.info "Available addons: #{available_addons.inspect}"
+      @available_addons
+    end
+
+    # Find the version for the specified addon, if none if multiple addons with the same name
+    # are found an exception is thrown.
+    #
+    # @return [String] the addon version, e.g. "16.0"
+    def find_addon_version(name)
+      raise Errors::Registration::ExtensionNotFound, name unless available_addons
+
+      requested_addons = available_addons.select { |a| a.identifier == name }
+      case requested_addons.size
+      when 0
+        raise Errors::Registration::ExtensionNotFound, name
+      when 1
+        requested_addons.first.version
+      else
+        raise Errors::Registration::MultipleExtensionsFound.new(name,
+          requested_addons.map(&:version))
+      end
+    end
+
+    # Construct the base product data for sending to the server
+    def base_target_product
+      OpenStruct.new(
+        arch:       Yast::Arch.rpm_arch,
+        identifier: product.id,
+        version:    product.version || "1.0"
+      )
+    end
   end
 end
diff --git a/service/package/rubygem-agama-yast.changes b/service/package/rubygem-agama-yast.changes
index 56e86cfbd6..319641179a 100644
--- a/service/package/rubygem-agama-yast.changes
+++ b/service/package/rubygem-agama-yast.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Apr  1 12:44:57 UTC 2025 - Ladislav Slezák <lslezak@suse.com>
+
+- Make the extension version attribute optional, search the version
+  automatically if it is missing (related to jsc#AGM-100)
+
 -------------------------------------------------------------------
 Fri Mar 28 21:45:56 UTC 2025 - Josef Reidinger <jreidinger@suse.com>
 
diff --git a/service/test/agama/registration_test.rb b/service/test/agama/registration_test.rb
index b906fb19d9..49ecc9553c 100644
--- a/service/test/agama/registration_test.rb
+++ b/service/test/agama/registration_test.rb
@@ -239,6 +239,27 @@
 
       let(:code) { "867136984314" }
 
+      let(:ha_extension) do
+        OpenStruct.new(
+          id:                2937,
+          identifier:        "sle-ha",
+          version:           "16.0",
+          arch:              "x86_64",
+          isbase:            false,
+          friendly_name:     "SUSE Linux Enterprise High Availability Extension 16.0 x86_64 (BETA)",
+          ProductLine:       "",
+          available:         true,
+          free:              false,
+          recommended:       false,
+          description:       "SUSE Linux High Availability Extension provides...",
+          former_identifier: "sle-ha",
+          product_type:      "extension",
+          shortname:         "SLEHA16",
+          name:              "SUSE Linux Enterprise High Availability Extension",
+          release_stage:     "beta"
+        )
+      end
+
       it "registers addon" do
         expect(SUSE::Connect::YaST).to receive(:activate_product).with(
           addon, { token: code }, anything
@@ -255,6 +276,46 @@
         subject.register_addon(addon.identifier, addon.version, code)
         subject.register_addon(addon.identifier, addon.version, code)
       end
+
+      context "the requested addon version is not specified" do
+        it "finds the version automatically" do
+          expect(SUSE::Connect::YaST).to receive(:activate_product).with(
+            addon, { token: code }, anything
+          )
+
+          expect(SUSE::Connect::YaST).to receive(:show_product).and_return(
+            OpenStruct.new(
+              extensions: [ha_extension]
+            )
+          )
+
+          subject.register_addon(addon.identifier, "", code)
+        end
+
+        it "raises exception when the requested addon is not found" do
+          expect(SUSE::Connect::YaST).to receive(:show_product).and_return(
+            OpenStruct.new(extensions: [])
+          )
+
+          expect do
+            subject.register_addon(addon.identifier, "", code)
+          end.to raise_error(Agama::Errors::Registration::ExtensionNotFound)
+        end
+
+        it "raises exception when multiple addon versions are found" do
+          ha1 = ha_extension
+          ha2 = ha1.dup
+          ha2.version = "42"
+
+          expect(SUSE::Connect::YaST).to receive(:show_product).and_return(
+            OpenStruct.new(extensions: [ha1, ha2])
+          )
+
+          expect do
+            subject.register_addon(addon.identifier, "", code)
+          end.to raise_error(Agama::Errors::Registration::MultipleExtensionsFound)
+        end
+      end
     end
   end