I saw a post with a suggestion I tried and it worked like a charm:
Disable the Play Store auto-updates for apps and it'll stop reverting the app to the demo version.
Step-by-step:
On the home page, click your profile pic, choose Settings, under Network Preferences, click Auto-update Apps, and choose Don't Auto-update Apps.
You can then install the Android version from itch.
If you want to turn auto-updates back on without updating Hollywood, follow the above steps but choosing either update over Wi-Fi or Any Network, then find Hollywood in the Play Store, click the three-dot menu button, and uncheck "enable auto update"
Voila, all of your apps will auto-update except Red Embrace: Hollywood.