The Launcher needs to be installed on the same drive as the engine versions and we don’t recommend moving any of the file structure once it is.
I recommend uninstalling what engine versions you have, uninstall the Launcher, and reinstall it on whichever drive you prefer. Let me know if that works you or not.
It’s technically possible but we don’t recommend it. Here is a member or our Launcher team explaining how to do it. It’s an older post so some of the file paths may be a bit different.