I have 18.1 loaded onto a machine running Windows 11. Although not my main PC, Xara has been run a fir few times and loaded a couple of website projects and numerous photo/document projects.

Win 11 was a fresh install and I would have run Xara as Administrator the first time out of habit. Win 11 has done updates with no ill effects so far. Happy to do a specific test if you'd like me to.