This is a hotfix.
In GE-Proton7-1 I was applying the castlevania save patch, which was already fixed in upstream proton. This caused breakage in various installers (such as Visual C++ runtime).
I've removed the patch since it's no longer needed and it resolves the issue. Notably:
-Fixed broken launcher in Warframe on new prefix
-Fixed various broken protonfixes
-Fixed broken controller input on clean game prefix creations
-Fixed failed installation for Batman Arkham City
-Fixed failed controller input in Batman Arkham Knight