In my case, I typed $/./AltiumLib/AltiumLib.PcbLib (You have to do this because the GUI is expecting a directory name, but it’s a file). (Here’s the tricky part): In the Library Path column of the new row, MANUALLY TYPE THE NAME OF THE.In the Library Format column of the new row, select “Altium Designer”.In the Nickname column of the new row, type your nickname for the imported library.In the Footprint Libraries window, click on the “+” sign (“Add empty row to table”).Click on Preferences => Manage Footprint Libraries.Click on PCB Editor or Footprint Editor (both work). Download and run a KiCAD “nightly” build.(If nothing else, it will help me remember three months from now when I need to do this again, but I hope this is helpful to the general community.) This has been covered in various other posts, but I’ve tried to patch together all the bits of info into one clear recipe.