Patch doesn't work after Steam "upgrade", you can rollback using time vault before Oct 7th and it will remain working offline as when you connect to Steam then upgrades ( their word not mine) CF are trying to redo patch but given resources may take some time, all Mac users will be greatly appreciative once again when its working. If your DLC are also not showing up remove the file to somewhere safe out of RS folder and reacquire and verify, hope this saves you searching all over the net as I have already