It would be nice if Arc offered an Uncompressed version...  As I've seen a few images get lost in compression and really don't think these are unrpa issues like he claimed on Patreon.  Though he was all for putting everything in rpa as drm.
If you have a copy of the old version v0.9.0 you could just use the update patch.
I'm not sure if just replacing the Ren'Py engine with 7.3.5 would work even if the underlining game files are the same.
Though if you wanted to try that then
- Backup the game's Ren'Py engine.  Pretty much everything in the Main Game Directory besides the "game" folder.
- Delete those files
- Extract these files to the Main Game Directory.
- Play
Mega
Edit:  Funny enough the last time I see that loading correctly was from 0.6.9
Eh I'll Include it in the event it helps