To clarify a bit, make sure you have installed the latest AIJ package (v5.1 currently) from the AIJ website:
https://www.astro.louisville.edu/software/astroimagej/installation_packages/Also, make sure you installed into a location where you have write access to the hard drive (program_files is locked down now without some extra work). It's easiest to just install somewhere like in the documents folder.
In case the above does not address the problem, we are attempting to download Windows 11 on a spare laptop, but will need a couple of days to get that done and test on our end.
Karen