At first, I followed the instructions that came with the disk and clicked on the "install" button and was told that the computer operating system was not compatible with the program. However, I did notice that the disc had a note on it's package that said "Includes version for Mac OS etcetc" (I can't recall the exact numbers but it was my machine's OS) so I looked at the disk contents and discovered that there was a subfolder that had a separate set of install files for the older system. I then clicked on that and all went well!

The program works seamlessly, as it's previous version did. I had uninstalled the previous version before installing this one just to make life easier in case of conflict, and everything worked.

The one criticism I would have for Norton is that the auto-install facility should direct the user to the older version, which is on the same disk after all, rather than simply say that it was incompatible and cause a good deal of frustration... Read more

I downloaded this from Amazon and installed it under Mountain Lion. My MBP rebooted, and NAV needed a second Live Update and reboot to finalize the installation. I have all options enabled. There were no problems after the first ML update.

A full scan takes longer than I would have thought. Overall, there seems to be a slight reduction in computer speed. It took a few chat sessions with tech. support to locate a link to a user's guide.

Since I ran Norton AV on my PCs for years and never had virus issues, I wanted to give it a year's subscription time on the MBP to see if I needed it. My Apple friends refuse to run anti-virus software but my PC experience makes me skeptical that any computer can run without virus/malware protection. I would be overjoyed if Apple proved me wrong.

Purchased NAV12 download directly from Norton.com for use on various Macintosh machines. The download and install was completed initially on a new Mac Pro running 10.7.2.

Downloaded and installed cleanly and relatively quickly. Upon launch the Auto-protect toggles were off and when I tried to turn them on was prompted to use LiveUpdate to update files. LiveUpdate was unable to deliver all files completely, some red, some green. Made a few more attempts, no avail. Still was unable to enable Auto-protect and could not even run a quick scan. The scan engine could not be run at all with the constant prompting to run LiveUpdate (over and over and over, ad nauseum).

Worked with Norton tech for over an hour, nothing we tried worked. Finally gave up, they issued a refund for the subscriptions and I uninstalled using Terminal (because I didn't trust the uninstall utility that was bundled in the download). Support from Norton was excellent though, as they always have been... Read more