How to switch versions of .umap files (from 5.1 to 5.0)

After switching the version of .uproject from 5.1 to 5.0, I find that I cannot switch the version of .umap. How can I switch the self-created levels (not the default) in my project file to 5.0 together with .uproject? Thanks!

you can’t downgrade a project generally - what you could do is install 5.03 and migrate the content of the project from 5.1 to 5.03 and see if that works and then open the level in 5.03. Not sure if this will even work but it might.

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