Unreal Egnine 4, all of them, stopped working - Failed to launch editor

[Doctor_Kannon]

I was trying to reinstall 5.5.4. This thread provided the solution. Thank you!

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I’m trying to get a fresh install of 5.5.4. I uninstalled 5.5.4. In the Launcher I have only the option to install 5.5.0. This is expected. All engine versions are listed as dot-0. Others in this forum have successfully installed the current version after selecting dot-0. However, the Launcher is unresponsive. I click on the “+” button and in the greyed-out tag, I select version 5.5.0 and click “Install”. But nothing happens. The top right yellow dropdown tab says that 5.5.0 is “Not Installed”. …