iWork suite won't work on Mac 10.11.6 (says:Numbers cannot be opened because of a problem)-Any ideas why?.
my iWork '09 suite will load and work on my 10.6.8 mac but not the 10.11.6 mac. They are installed from the iWork disc. Any of you gurus have any idea why? the pop-up box says" Numbers cannot be opened because of a problem." It's a MacPro 4,1
Mac Pro, OS X 10.11