The Web Page, it's broken as of 2 weeks ago.
It worked for 'years' fine up until 2 weeks ago. Someone broke something. I have a significant number of licenses on different accounts that need to be freed up via the web portable deactivation because for some reason Stardock decided their products shouldn't de-activate when uninstalled.
If you try it now it redirects to an invalid link and nothing can be done.