If Thor is not installed on your computer for some reason and you wish to reinstall it, but you forgot/misplaced your license key, here is what you need to do:
Search the email received from Heimdal Security that contains your license key.
OR
If you can't find the email we sent you, contact us at support@heimdalsecurity.com with the subject "License Key lost", accompanied by a small description of the issue, if necessary, and the email address you used to purchase Thor. We'll find the license key for you and provide a copy, so you can start using the product at its full extent again.