We’re having issues trying to install Unreal Engine in our lab of 25 Macs. I’ve been searching for a solution but have come up empty handed. I found an unanswered question from someone with the same problem in the Epic Games Launcher community, and I’ve borrowed his description of the problem, as he explained it better than I could:  

We’ve installed Epic Games Launcher and Unreal Engine 5.2.1 on all of the Macs. When any other user logs in to use Epic Games Launcher and Unreal Engine, in the Unreal Engine section it asks to install Unreal Engine again, not recognizing that there is already a version installed. When you click Install it tries to install it to the exact same place and throws a ‘Directory must be empty’ error. (Obviously the directory isn’t empty because it already contains Unreal Engine)

Unreal Engine is installed to the default /Users/Shared location, and permissions on the /Users/Shared/Epic Games and /Users/Shared/Unreal Engine folders (and their contents) are set to read/write for everyone.

Has anyone else seen this issue, and if so, how did you resolve it?  Epic Support has not been any help – they told us to talk to Unreal Engine support, which is the community boards, unless you have a support contract.