Fails to build on Win 8.1

[Boscop]

Thanks for making this crate, it seems to be the best GUI option for Rust for now.
I followed the instructions but it fails to build:

error: failed to run custom build command for `cef-sys v0.1.0 (https://github.co
m/dungeonfog/cef-sys.git?rev=a3d43fc9a624dc00e5a5cea90eebf88fd6c4aa5c#a3d43fc9)`


Caused by:
  process didn't exit successfully: `D:\3rdparty\cef\target\debug\build\cef-sys-
bc464d71e680b978\build-script-build` (exit code: 101)
  --- stderr
  Fetching from http://opensource.spotify.com/cefbuilds/cef_binary_84.3.10%2Bga4
6056b%2Bchromium-84.0.4147.105_windows64.tar.bz2
  thread 'main' panicked at 'Server responded with HTTP result 404', C:\Users\me
\.cargo\git\checkouts\cef-sys-f4b4510fe2f5be6e\a3d43fc\cef-installer\src\lib.rs:
66:21
  stack backtrace:
     0: std::panicking::begin_panic_handler
               at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c\/library\std\s
rc\panicking.rs:493
     1: std::panicking::begin_panic_fmt
               at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c\/library\std\s
rc\panicking.rs:435
     2: cef_installer::download_cef
               at .\cef-installer\src\lib.rs:66
     3: build_script_build::main
               at .\build.rs:92
     4: core::ops::function::FnOnce::call_once<fn(),tuple<>>
               at /rustc/42816d61ead7e46d462df997958ccfd514f8c21c\library\core\s
rc\ops\function.rs:227
  note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose b
acktrace.
warning: build failed, waiting for other jobs to finish...
error: build failed

D:\3rdparty\cef>set LIB
LIB=D:\3rdparty\_rustlibs\64bit;D:\3rdparty\_rustlibs\64bit\cef

D:\3rdparty\cef>dir D:\3rdparty\_rustlibs\64bit\cef
 Directory of D:\3rdparty\_rustlibs\64bit\cef

2021-05-14  14:40    <DIR>          .
2021-05-14  14:40    <DIR>          ..
2021-05-06  11:53        68,168,330 cef_sandbox.lib
2021-05-06  09:20         1,129,984 chrome_elf.dll
2021-05-06  05:02         4,346,120 d3dcompiler_47.dll
2021-05-06  06:06        10,413,488 icudtl.dat
2021-05-06  11:38       153,111,040 libcef.dll
2021-05-06  11:38            37,466 libcef.lib
2021-05-06  09:14           407,040 libEGL.dll
2021-05-06  09:14         6,799,360 libGLESv2.dll
2021-05-06  11:35            48,390 snapshot_blob.bin
2021-05-06  11:53    <DIR>          swiftshader
2021-05-06  11:35           165,509 v8_context_snapshot.bin
              10 File(s)    244,626,727 bytes
               3 Dir(s)  494,585,720,832 bytes free

I had already extracted the cef binaries from https://cef-builds.spotifycdn.com/cef_binary_90.6.5%2Bg7a604aa%2Bchromium-90.0.4430.93_windows64_minimal.tar.bz2
so why is it trying to re-download them? :)

(Btw, the link in the Readme is outdated: https://www.spotify.com/fr/opensource/cefbuilds/index.html/ is not found. I found it here: https://cef-builds.spotifycdn.com/index.html#windows64)