A heads up for whoever bought the $20 version when it was 50% off.
If you're using the itch.io app, you wont be able to download the newer version (in my case)
Solution: go to the website, click on the drop down menu to the right of your profile and click downloads. Go to My Purchases. Download from there.
Its the same as finding the email from when you first bought the game and got the receipt.