For anyone still searching for the MarketplaceRules.dll file, I finally found it at the following path on my windows system:
C:\Users\<Your-USER_Name>\AppData\Local\UnrealEngine\Intermediate\Build\BuildRules\MarketPlaceRules.dll
where replace with your actual username on the system.
Then this file must be placed at the path as expected in the error logs on the remote macOs system. For me that path only partially existed but i created the missing directories and copied the file there:
/Users/<YourUserName>/Library/Application Support/Epic/UnrealEngine/Intermediate/Build/BuildRules/MarketPlaceRules.dll