Sorry, have to ask these questions:
OS and kicad version. You’ll find them in Kicad / Help / About Kicad / Top RH corner, copy that and paste into this forum.
In KiCad, footprint libraries are quite simple. Each file is a footprint, and a “Library” is just a folder.
So first get those footprints out of your “Downloads” folder, and put them in some directory of their own. After that go to KiCad / Preferences / Manage Footprint Libraries and then add the folder to the table by clicking on the little plus button in the lower left corner.
here is the example lib
and from the example screenshot you can see that when opening the folder via the footprint manager I can see nothing, although files are there because when copy and pasting, I have an error about renaming files or something (idr right now), also when I use the file explorer I can see them
then I go to the after mentioned window
and there is nothing
I tried the 4 footprints and all works as expected. So no problem with the Fp-files itself.
regarding your last screenshot “Choose footprint”-window: you have scrolled to far - the “M.2-Templates” library is alphabetically before the “Package_xxx”-libraries
Are you 110% sure the complete directory-path in the “Manage footprint libraries” window is correct? Have you tried to delete that entry, add a new entry and than freshly select the directory?
Have you tried to copy the 4 *.kicad_mod files into a existing footprint-library-directory, just to be sure “it works” in principle?