App cannot handle modpack versions being deleted whilst installing

[sleepy-evelyn]

Please confirm the following.

• I checked the existing issues for duplicate problems
• I have tried resolving the issue using the support portal
• I have ensured my Modrinth App installation is up to date

What version of the Modrinth App are you using?

0.12.5

What operating systems are you seeing the problem on?

MacOS

Describe the bug

This is a bug reported by multiple users on a large SMP server.

I released a new version of the Create SnR modpack: https://modrinth.com/project/9a0qj1oH
but decided to delete the version after we realised we had to rollback changes.

The problem is I think some users were in the process of installing this version when this happened and therefore they are now unable to do anything with those modpack instances. They're essentially completely bricked.

There really should be a failsafe here for this kind of thing and i'm surprised it hasn't been tested.

Steps to reproduce

1. Upload a version of the modpack
2. Users start downloading this version
3. You realise there is a mistake with the version and need to delete it
4. Users who are installing this version of the modpack can no longer do anything because the Modrinth App is trying to install an invalid, deleted version. They get an Invalid input: Linked modpack version not found

Expected behavior

No response

Additional context

[sleepy-evelyn]

I should also mention that we didn't have any issues with other launchers. Both Prismlauncher and ATLauncher worked fine. Most of our players use Prismlauncher as the reccomended method so it's likely to be an issue with the Modrinth App specifically.