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Sophos - Installation Instructions for Mac OS X

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You must be logged in with administrator rights to install Sophos AntiVirus.


You may see cosmetic differences in the install process depending on what version you're using.

  1. Download the Sophos installer from the Software Grid (certificates required).
  2. Double-click the download named mit-sophos-av-osx.dmg to open the disk image.
    Result: a window named MIT Sophos Antivirus opens.
  3. Double-click the file named Sophos Anti-Virus.mpkg.
    Result: The Sophos installer opens.
  4. Click Continue to accept the warning that "This package will run a program to determine if the software can be installed" and allow the installer to run.
  5. Click Continue on the Introduction / Welcome screen.
  6. Click Continue after you review the Read Me/Important Information.
  7. Click Continue after you read the Software License Agreement.
  8. Click Agree to continue installing the software.
  9. Enter a Mac administrator username and password.
  10. Wait for the installer to finish.
  11. Click Continue after reviewing the Completion screen.
  12. You are done! Click Close.


Unapproved Caller. Security Agent may only be invoked by Apple software.

This error is usually caused by a computer that is preparing to/needs to be rebooted before the software can be installed. Try rebooting and running the installer again.

Normal operation

When installation is finished, Sophos will check for updates. You can see a shield icon in the menubar with an animated arrow indicating that Sophos is downloading updates:

When sophos is fully updated, the menu-bar icon showing that Sophos is protecting your system is a shield with an "S" inside:

Can it be uninstalled?

Sophos Anti-Virus comes with an uninstaller in case you want to remove it (we hope that you won’t). Simply run the Remove Sophos Anti-Virus.pkg installer in /Library/Sophos Anti-Virus/ .

Where can I get more information?

Look in the Help menu for Sophos Anti-Virus for Mac help. Click here to learn more about Sophos Anti-Virus.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

July 06, 2017

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