You need to download the full apk from itch.io and install it.
Here are the instructions:
https://www.homenetgames.com/warplanes-ww1-fighters/article/warplanes-ww1-fighte...
I figured it out. Thanks. Just want to say I am a big combat flight sim fan, been playing most of the WW2 sims for years. I am really impressed with what you have done with WARPLANES. Thanks for your efforts
