Bill MacSems commented,
As I said earlier, I have down loaded GPO 4.02. I managed to open it and it connected with my Sibelius 6.2.0. Then reopened security & privacy to close "anywhere". I believe that was the reason GPO...
Bill MacSems created a post,
I have downloaded this program but cannot install it because a drop down message appears stating; “MAC_Garritan_Personal_Orchestra_4.02.mpkg” can’t be opened because it is from an unidentified deve...