I had at first discovered the fact that I needed to use Unreal 5_3 on my own, which allowed me to view the files in general. However, many files are missing from the lists, which can be seen in the screenshot below where I am viewing the FICSIT foundation folder, where there should be far more pieces than are actually present.
I tried following the other steps, like inserting the custom versions information, and providing the directory to the Local Mapping Directory (.usmap) file but this did not help.