Members with "App not installed" Problems try this Method.
Follow my Easy Steps:
Download the APK/
Open LP let it load.
You see all your apps/Games etc.
Click on the APK with installation Problems.
Open the "Modified Folder" in LP.
Install the APK.
95% All Apps/Games works with this Method!
Sometimes You can install and play Rooted games with non Rooted Devices.