The first question is how to get the ISO of Windows 11. You would not like to use a valid license just for evaluation and testings. Luckily Microsoft gives you free access for evaluation purposes to many of its products for a limited amount of time. In the case of windows, you get a fully functional Windows 11 enterprise for 90 days which is more than enough for evaluation and testing. The link to the evaluation center is: -us/evalcenter/ and the link to Windows 11 is: -us/evalcenter/evaluate-windows-11-enterprise. If you need more than 90 days, buy a license or, in case of emergency, look at the Microsoft official documentation for the slmgr.vbs utility at: -us/windows-server/get-started/activation-slmgr-vbs-options.