I got v0.3 mixed up with an older version somehow, so instead of trying to track down the missing version I've just updated the paid Itch version to 0.3.5. Thanks to user Ariyana for bringing this to my attention.
Just got the update, didn't realize since the update email went to spam. I unzipped and it seems to have a packaging error: createinstance() returned: 2
The solution's pretty simple, thankfully:
Completely delete the Intermediate, Saved and Build folders, then re-package.
