I've had this issue with other add-ons installing to msfs2020 community folder, so I've had to revert to using MSFS Add-On Linker, which works great, but since the Flysimware 414AW installer doesn't allow for other install folders, I can't install my purchase. Now before everyone suggests verifying Regedit or GPEdit entries for long file names, that's already been done, as has rebuilding permissions for msfs install folder, verifying drive integrity. MSFS works fine, shortcuts created from Add-on linker are installed correctly. If have done everything on every website I can think of, but still can't install this software. Flysimware as are many other add-on providers are aware of this issue, as they suggest contacting their customer support for a workarounds. So far, I've not heard from them, other than to say, check that long file names are enabled, which as I said, has been done.
Any suggestions greatly appreciated, thanks in advance.