Hey Adam,
This is most likely an issue with the servers on Itch, it happens time to time.
If this persists, I'd recommend using our Patreon downloads. The free version of 8.0.3 dropped (won't be on Itch for a bit) and you can grab it here: https://rift.ink/43QZB9R
You'll need a Patreon account (free to make if you don't have one).
Hope this helps!