I have a similar issue, but I have avast! Premium on both of my mobile devices AND avast! Internet Security (Premium) on my PC. When I opened the "My Devices" tab on my PC, I discovered that neither my Samsung Galaxy Note 10.1 nor my Samsung Galaxy S3 are listed as having the premium version. They show the free version. Why is this? And I can find no option to change that status, either on my mobile devices or my PC.