Solved
SIMS_4_V2_PC_CLIENT folder appeared in Mac Home folder
After patching Sims 4 to 1.115.216.1230 this folder has appeared in my Home directory:
with the version number at the main menu being correct but [SDK: UNKNOWN] added:
There is only one...
This has now been fixed in the 1.116.202.1230 patch today. When you launch the game for the first time after updating the SIMS_4_V2_PC_CLIENT folder should be automatically removed from the Home folder. If it's still there make sure the folder has read/write permissions so the update can remove it (see opening post above).
If anyone is interested, the folder has now been relocated to ~/Library/Application Support.
