Curious thing I had happen to a project.
What started as a project in the 5.0EA build, next time I open the EA Launcher, that project was labeled as “5.0” (sans EA) and I could no longer add marketplace assets to the “5.0” project.
So to workaround, I just launched UE 5 Early Access, then opened the “5.0” project within it–it gave me the “this was made with a different version” error–I continued by clicking Open a Copy, now the Launcher shows me the exact same project, one as UE 5.0 EA and one as just 5.0.
This is what it looks like adding content to projects–and it shows me a clear discrepancy between these two projects. Somehow one project has been identified as not EA.