Once you receive your key via the email address used for purchase: License transfer to new PC - Google Groups
Install the extension from the official browser store (Firefox Add-ons or Chrome Web Store). Open the extension's settings or options menu. Locate the "License" or "Register" section. License Key For Video Downloadhelper
Once upon a time in the vast landscape of the internet, there was a handy tool called Video DownloadHelper Once you receive your key via the email
While many users rely on the free version, a paid license key is necessary to: License Key For Video Downloadhelper