I think that is a github issue, I've had similar issues on another repository. It seems clicking the RAW button yields another link: https://github.com/pamods/LavaSnake-s-Mods/raw/master/Releases and Icons/FloatingFramework_v2-0.zip that still works, while the other raw links witgh the raw=true seem to fail.
Odd, I've used that link for my mods for awhile and it's been fine. I'm not getting the issue when I reinstall any of my mods including this one. I'm guessing it was just an error with GitHub. I'll try switching it to the above link though if anyone continues to have issues. Thanks for reporting/helping with this!