For what its worth, my program does do file integrity checks with what it installs from Roblox’s Amazon S3 bucket.
Granted, these are MD5 checksums so they aren’t cryptographically secure, but unless this is a really smart trojan that is somehow tricking the file integrity checks for both the zip files and individual files of those files seamlessly in the background, I am skeptical that any Roblox Studio builds being installed by my program are infected.
As to what extent the application itself is actually infected, I have no clue. I’m scanning my system right now to see if it picks up anything. If you have any other suggestions, let me know. Again I really want to believe this is all a false alarm, but the evidence presented by @ForbiddenJ has me concerned.