When you can not install the app due to an unknown error when downloading the APK file – Paid version of the app.
★If you try to download the paid version of the app produced by Swing2App on the Android phone (before the Play Store)
What is the reason?
If you’re using the app in a paid version and you don’t want to launch it on the Play Store, Google recognizes this as an unknown path, and you’ve randomly blocked the installation, so it’s not going to be installed properly.
Please select the Play Protect menu.
But besides this case, it may not be installed due to the security of the Android phone set by the user.
Please check the manual link for Android phone security settings.
☞ [Please check if the free version of the app does not download]