Hey, you should be able to re-download the newest version from the Main page once you purchased it. I didn't set up any restrictions here. However, I'm still new to itch.io, so maybe I made a mistake. If you cannot re-download the newest version, please send me a PM or mail (m.kampermann@gmail.com) with your e-mail address, and I will send you a custom download key.
I was able to download on the main page. Its just odd because the main page doesnt show any update, and trying to download from this update log makes itch ask me to re-purchase as if I never owned it.
Your support is much appreciated. You should probably manually add a note on the main download page that states the latest version number or something so others in the future dont get confused like I did. Itch is a great platform but sometimes can be really jank.