I can't use the app offline
You are being prompted to perform a license check at every launch and going online to retrieve a cached license does not provide any offline access afterwards.
If you have installed the application manually from an apk installer or from a backup application, rather than via the Play Store, the offline license file may not be issued or not may be validated correctly.
Ensure that the application has been installed through the Google Play Store. If you have previously used patching tools to modify the Play Store or Android or application frameworks, please ensure these modifications and tools are fully removed first.
Unfortunately we are unable to manually issue, or alter licenses, as these are managed by the Google Play License servers. These restrictions are sometimes temporary and user account specific.