"Thumbs up" to the advice, above.
Just adding the corresponding article to this thread, for the benefit of any Mac users whose Internet searches land here in the future: SEP 12.1 has different OS support requirements than SEP 11. Some older Macs can't have SEP 12.1 installed on them (but can operate with SEP 11, and be managed by a SEP 12.1 SEPM)
About Changes in Supported Macintosh Hardware in Symantec Endpoint Protection 12.1
Article: TECH167774 | Created: 2011-08-23 | Updated: 2011-11-11 |
Article URL http://www.symantec.com/docs/TECH167774