youyong
I’m using 5.5 and I had the same problem. At first this solution didn’t work for me. I Wrote “Editor” in manually and for somehow I messed that up(no idea how). The project would not open with the plugin so I put back a copy of the file. Seeing everyone else having success with the method I redid it but this time I copied the text from another part of the settings and now it works.
Not sure why UE hasn’t fixed this or what the point is of having it stop packaging projects. I see metahuman is stil experimental but they have been pushing this tech for years at this point.