I keep getting app not installed even with plenty of storage and when looking it up lots of people say it could be a corrupted APK file and I was just letting you know, I don't know why it says this but I tried other APK and they worked just fine so idk

Howlies Blaizedragon,
Renpy is a bit problematic, there's a good chance you'll need to install an additional app called APK downloader.  They're free on the Google Play store, and should help finish your download.  My apologies for any inconvenience.  Please let me know if this does resolve the issue.