Was going to post this before, but hadn't read much about it so figured everyone was doing O.K. with the current Windows upgrade. I don't consider myself a big-time flight simulator user, but I have the whole TW package with a variety of separated installs and upgrades on both my W11 desktop and my W10 notebook (and yes, alongside some other "more modern" flight simulators) and no issues with any of them right out of the box when W11 became available. Regardless of W10 or W11, and IMHO, the only noticeable difference between the two rigs running either SF2 / FE2 is how the software interacts with the installed graphics cards capacities. To wrap this up, my biggest problems have nothing to do with the operating systems, but invariably come from occasionally trying to stretch the capabilities of the TW flight engine a little too far, and of incorporating an occasional "self-inflicted wound" (read "stupid change that doesn't work") into the programs.