You may activate one license on one device.
The old device will be automatically unactivated. No other actions needed.
No. Dir will never use your unique device ID to activate.
If you purchased via store, you do not need to backup, since it is saved in your account.
If you purchased via other methods, you may need to take a screenshot at the order or other serial numbers.
No. It is a lifetime license. You do not need to purchase another one.
No. This is illegal due to Google Play Terms.
No.
Feel free to contact us: support@appline.xyz