This is a tough issue; we're actually unable to reproduce said problem on our side, I suggest for now that you download from our other official pages. See if it persists. Or you may have to delete your persistent savefile.
Well my UI has returned. I removed the persistent file and it's back, though in trying to test it being the cause and putting the file back, the UI remained, so who knows. Either way I can use it again. Sadly there's no recovering my saves anyway, so that's just bullet to bite regardless.
I didn't end up trying the other downloads at all.