Thankyou for your time and attention. After entering the key in the format previously described , I get this message Thankyou ! Your license key is successfully loaded. I click OK and the programme opens , then immediately closes again and presents the Welcome message and requests the product key again. I am unable to escape this loop situation unless I choose the Continue with trial option. The help section still says Unregistered version. I do not have Video Builder. I am copying and pasting the key from a .txt file that I saved in My Docs. Thankyou again for your assistance.