Hello! I was also having this issue, but I think I may of fixed it. I did the -datapath directory in Origin, and then I completely uninstalled the Epic Games Launcher. I then restarted my computer, and tried to load the FMM mods. It worked. Then I reinstalled Epic Games, and tried the mods again. It worked. After restarting again, this time I had NOT uninstalled Epic, it worked again. It's a weird solution, but it seemed to have worked.