The only trick is that last step: What utility can you use to do that conversion? Parallels is using an “esd2iso” command line utility, and the UUPDump site uses one of the nastiest batch files I’ve seen in a long time. For example, these are the en-us images of interest: Pick the ESD file that you want and download it.That XML file contains a list of all the Windows 11 21H2 ESD files (client/retail and business/VL) in all languages.
Fortunately, it doesn’t take much effort to figure that out (with Fiddler to help). I was trying out Parallels Desktop 18’s new feature that allows it to automatically download Windows 11 for ARM64 to install a new VM, and wondered how exactly that worked.