[Launcher] Download and run xenko as one file

[tebjan]

Is your feature request related to a problem? Please describe.
Although i haven't experienced it myself, it seems to happen often that a user is not able download all nugets properly.

Describe the solution you'd like
Provide all xenko packages as one file and (optionally) download that directly. Like a plan b that can be triggered via a button by the user, if nuget.org fails.

The file could contain all nugets and could be extracted into the nuget cache, so it has the same behavior.

Prerequisites still need to be installed, of course.

Describe alternatives you've considered
Not sure, probably try to re-install xenko via launcher normally.
Also, maybe the launcher could have a 'clean' button to do a fresh install. Similar to the Nvidia drivers that can do a clean re-install.

Additional context
Easy installation for newcomers/non developers.

[profan]

This would be nice to be able to have completely separate of the launcher too if possible (alongside the launcher download, just something like a launcher + latest set of packages bundled as a big archive), it's certainly something a lot of people stumble on.

If the very first use experience can be worked out, I'd wager people will be more forgiving of what comes after even if other things may produce some friction on next update or similar, at least by then they'll have had started out good and actually tested using the engine

[dfkeenan]

I have noticed that Visual Studio seems to cope better at downloading the NuGet packages. I got around the problem by opening an older 3.1 version and updating all the NuGet packages first. Then reopened the Launcher. Obviously not ideal. But maybe the Launcher could be made to better handle downloading?

[Kryptos-FR]

I just want to point out that there is a non-trivial cost associated with that feature. I will require hosting those files, which requires to pay a bill of some sort. Also if people are experiencing networking issues, then a bigger file might actually exacerbate the problem.

Therefore, I think it is better to first try to implement some retry/diagnostics mechanism to help identify the actual underlying issue, and collect that data.

[tebjan]

in this issue, the --no-cache flag is proposed as a workaround for failing http cache: NuGet/Home#3116

[xen2]

I have already added a fix for that in the past with a0459e3
This forces NuGet to fetch from server when a package was not found previous time.

However the cache is still used when doing the actual installation.
Not sure if the installation issues Xenko has are cache-related or download/protocol-related.

[tebjan]

ah great, maybe just release a new beta and wait for more feedback on this.

[xen2]

It's already part of the launcher for a while.

[tebjan]

ah ok, the download issues were reported quite recently. not sure what the issue could be then.

[phr00t]

Can you try using my different Xenko distribution method?

https://github.com/phr00t/xenko/releases/tag/3.1b-R1

Please mention me with results if you try it!