We ran into some issues getting the store panel to come up in internal testing, as some of us use Wine and CrossOver (based on Wine). It does indeed seem to be a dependency upon IE that is at the root of the problem.
For anyone that needs to redeem their coupon or purchase the software on Linux: user a browser and our web store instead. The only thing you need the software itself for is to check your serial and generate a discount coupon.
You’ll get your activation code sent via email. Set that aside for safe keeping, and use the “Enter Licence” button on the demo dialogue to activate. That part should work fine, so long as you have dotnet 4.6.2 installed correctly.
And yes, it works! I’m using it right now in Debian 11. 