There can be several reasons why your premium key is invalid. Check them all please:
1. Your program version is out of date. Visit our website and download the update if needed.
2. You are typing the wrong code. Just copy and paste it from your confirmation email.
Use our Key Lookup Tool to check if you're adding the correct Premium code.
3. Make sure that there are no O letters in the key combination, only 0 (zero).
Here is what the code looks like: FB5C08D6V01230AC7ETR2C8F1
If the error persists, submit a request to our support team and send the screenshot of the program window with the error on it, please.