I bought premium but it doesn't work

1) Please ensure you are signed into the same Google Play Account as when you bought AppBlock Premium. You can easily check this by going to the Google Play Store --> your profile picture --> Payments and subscriptions --> Subscriptions. If AppBlock is in the list, then you are signed in correctly. If not, please sign in to the correct account. 

2) Go into the Troubleshooting section of AppBlock. At the bottom you will find Restore purchases. Enter your Order ID. 

3) If none of this helps, clear the Google Play Store cache - usually under settings --> applications --> play store --> storage and cache --> clear storage --> close the settings and reopen the Google Play Store. Close AppBlock (remove it from recent apps) and reopen it.