Thank you, I tested on my system. And, I saw the same thing. I believe "unsupported" should not be there. It should be working without issue on Windows 10 system. You can go ahead and download the installer and install it.
For the issue, I have forward your problem/question to Stardock Support Team for their review. We appreciate your feedback and patience.
Thank you.
Basj,
Stardock Community Assistant