If the root drive on the Mac is read only, you may be out of luck. I tried putting the "attachment" subfolder with the Form1116ScheduleB pdf in my TurboTax folder and also in the Documents folder and neither of these worked for me either. Since I was a PC guy for over 30 years before switching to a MacBook last year, I'm not as familiar with the internal workings of a Mac as I am with the PC, so I was reluctant to even try to install anything on the root drive of the Mac. So I just went back to my desktop PC and it worked there. Best bet probably still is to wait and see if TurboTax installs an update; a lot less trouble.
