Norton AntiVirus Defs are the latest anti-virus detection files. The installer will automatically update Norton AntiVirus for Mac virus definitions and engine files to detect and repair the most recently discovered Macintosh viruses. This file is a self-extracting archive which contains the Norton AntiVirus Virus Definitions Installer.

Once downloaded and expanded on your hard drive, simply double-click on the Installer and the appropriate files will be installed on your computer.

They are also available via the LiveUpdate feature.

How to update Symantec Norton AntiVirus for Mac:

  • Click on the download now button found here.
  • Depending on the version of your Norton product the Intelligent Updater file should be:
    • For Norton AntiVirus 11.x (Intel Processor), click the first file name in the list. The file name starts with NavM_Intel_Installer. e.g.
    • For Norton AntiVirus 11.x (PowerPC processor) and Norton AntiVirus 10.x or earlier versoins (PowerPC or Intel processor), click the second file in the list. The file name starts with NavM9_Installer. e.g.
  • Once the file is downloaded, extact the zip file.
  • Double-click the installer file SymantecAVDefs_ppc.pkg.
  • If prompted, type your Administrator password.
  • Click Install.
  • After the virus definitions are updated, click Quit at the next prompt.