Often we receive the message in this topic object.
If you purchased our license yet but our app enabled the purchase button again or say "Token changed" or "Zip error" you don't have to purchase it again!
The purchased license will last for the whole phone lifetime and you will get all the future updates and goodies.
So these are the possible cases:
If you see the "Purchase" button enabled then probably the zip file has been deleted from the phone, so make sure you have Wi-Fi enabled, the app will download the zip file automatically, so just wait a few seconds.
If you see "Zip error" it's because the phone unlock data is corrupted, so tap on app menu, then tap on "Refresh Unlock Data", it will trigger the new zip file download.
If you see "Token changed" it's because you used our app before the version 1.30, from that version we changed the token system, or because you changed some important phone settings, so please tap on menu button, then tap on “Send log file”, we'll fix the problem server side.