If you already purchased Premium, you can restore it without having to purchase it again.
(Premium is a non-consumable purchases item)
Please tap "Restore Purchases" button.
If you try to restore and nothing happens
- Make sure that you're signed in with the same Apple ID you used to make the purchase. Sign in with a different Apple ID if you need to.
- Check the restrictions on your device to make sure in-app purchases are allowed.
- Restart your iPhone.
If app shows "Regrant Failed"
Please purchase the software application first.
This message is caused when two different Apple ID’s are used when downloading the app and trying to restore a purchase.
- Sign out to the App Store
- Sign in again with the correct account
- Restart your iPhone
- Restore purchases with Cube app
If you can not fix by the above, remove app and reinstall it.