I'm not sure that can be stated as a blanket issue. I run Windows 11 and just fired up Creator NXT pro 8 with no problem.
I hadn't used it since before upgrading.In fact I haven't used it in a while.The first time I opened it I got a notification about SP4.I downloaded and installed that and then restarted and the program opened up again with no issues.
This may be an issue that affects you and some others but not all.
Make sure you have SP4 installed and Windows update run to get all of the Windows 11 post install updates (I got a few). Other than that I don't know. There's obviously something on your computer setup that Creator doesn't like.