Launcher download stuck when download source partially unavailable

[Supermarcel10]

• I searched the issue tracker for other issues covering my case
• This is a Launcher issue. (Usually if you can reproduce it with a fresh instance)

Describe the bug
Any selected game version will not work when attempting to download through the launcher. I believe this to be an issue with Mojang/Microsoft servers where the files are partially unavailable. The download hangs or continues very slowly, where instead it could raise an error that the files are unobtainable.

To Reproduce
Steps to reproduce the behavior:

1. Open launcher.
2. Click on '+'.
3. Select any Vanilla release.
4. Give it a name.
5. Launcher will get stuck downloading.

Expected behavior
Expected for the launcher to download the selected version. Took about 20-30 mins to download 5%.
Normal minecraft launcher downloads about 60-70% within 2-3 seconds, raises an error that files could not be downloaded (possibly due to a faulty mirror or server from Mojang/Microsoft).

Possible solutions
Possibly look for issues with getting stuck obtaining the files. Raise an error or information that file could not be obtained or a timeout limit is exceeded.

Screenshots

Operating System:

• OS: Windows 10 20H2 19042.631
• Launcher Version: v1.1.29
• Java Version: 17.01 2021-10-19
• Minecraft Version: 1.19.3
• Mod Loader: Vanilla

Additional context
N/A

[FairyKairi]

This is also an issue with any new modpacks, no matter the version. I will make a separate post, if needed. Importing ZIPs also do not work. I have been trying to download ATMS Spellbound for two weeks now.

[Supermarcel10]

Looks like it may be a combination of multiple bugs:

• Importing ZIPs not working,
• Issue with successful downloads.

A mitigation should be done in the first place to prevent download issues. I.e. If a connection to a server is dropped, or a file fails to download, the launcher should continue the attempt for a timeout period, before throwing an error should be displayed rather. I'm not saying that's how it is in the source code, since I haven't looked into it - but that's what I would expect. (This might not be the case of my bug, but could be a high probability, since Mojang servers were degraded at the time of post, and it's possible the launcher could not establish connection/drop out).

I assume all of these bugs could be caused by a single very specific bug, like maybe handling of the files - since then it would be the same for ZIPs or online files.

[Eskaan]

Duplicate of #1513