I have several projects built on IJ Community 2018.3 . I just installed IJ Ultimate 2020.3 on a different machine. I copied the folders containing the old projects into the projects folder (~/IdeaProjects) of the new installation. But Ultimate refuses to recognize the old projects. If I create a new project in Ultimate, it shows up in the “Welcome to IntelliJ IDEA” window. But none of the others does, even though they are located underneath the same parent folder (~/IdeaProjects). How can I make Ultimate to pick they up?