This sounds absurd, but license servers use cryptographic time stamps. If your computer’s date is set to 2023 or 2028, the server will reject your “future” or “expired” key.

: Ensure you are running the latest version of the software. You can check this in the FAQ section or by downloading the latest installer from the YouTube by Click Firewall/Antivirus

: Activation keys are case-sensitive and often contain hyphens. Copy and paste the key directly from your purchase confirmation email to avoid errors.