Does your username in Windows have any unusual characters (such as ù or å) in it? This can also happen if any folders in the path have certain punctuation such as the & or ! characters.
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I resolved it by uninstalling and installing it again.
I did lose all my content and now I don’t know why I can’t get it to work again. (the content, my projects)
They were before I “fixed it” and could get it to uninstall and install again.
Then when I re-opened, the level was dark. There was nothing but a sunlight actor, which wasn’t on for some reason. When I pressed unlit, it didnt do anything.
Its like the universe I did died completely.
then I went to other projects and they werent there anymore, even if you can see their photo under my projects labels
Are you opening them in the same version of the engine that you created them in?
You could try to open the projects that ‘aren’t there anymore’ by going to the directory on Windows where those projects are saved and opening the .uproject file.