Our latest ErgVideo version 4.5 (and of course higher versions from there...) now do registration and unlock using your online account.
We're now supporting only that model and transitioning all customers to it. It carries with it some major benefits to everyone.
Get your new version of ErgVideo on your account page. Login, and click your "user-display" name that will show in the upper right corner. If you have purchased ErgVideos, the download buttons will appear on that page.