This error occurs when you enter the wrong key, typically a simple misspelling. First, make sure you have correctly entered your license key. The best way is to copy and paste it from your purchase confirmation e-mail.
If you, for some reason, are unable to copy and paste your license key, please take a closer look at your license key. A common mistake is to confuse 0 (zero) and O (the letter o). Also remember that all letters in your license key are uppercase letters.
If you still get an error, contact our support.