Follow the steps mentioned below if you have formatted your machine and you want to get back your premium subscription:
Download the latest version of the app player from our website www.bluestacks.com.
1. Click on 'All Apps' on the top-right corner.
2. Select 'My BlueStacks' from all the apps.
3. Click on 'CHANGE ACCOUNT' to enter the same credentials with which you purchased the Premium Subscription. The Premium Subscription will be carried forward on the app player.