When you launch the Sophos antivirus software on your computer, you would see a message “Sophos AntiVirus is not running.” In such cases, if you see an OK button on the message box, click it. Now, see if Sophos run normally. But, if Sophos doesn’t run, then there might be some issues with the version of Sophos installed on your device.To fix the Sophos antivirus not running issues, use the solutions given here.
Open a web browser on your Mac computer and go to the official Sophos site.
From the official site, download the removal tool for Sophos.
Extract the downloaded removal tool.
After extracting, run the removal tool and carry out the instruction to completely remove Sophos from your Mac.
Now, download the latest version of Sophos compatible with your Mac OS from the official Sophos site.
While downloading, if you see a prompt message, click the Allow option.
If you have downloaded the installer, locate it and make a double click on it to begin the installation.
In the installation window, click the Continue button.
Click the checkbox to accept the license agreement and then click the Install button.
Carry out the displayed instructions and complete the installation.
Now check if the Sophos antivirus not running error has been fixed on your Mac.
Solution 2: Update Sophos
Sometimes, if the Sophos antivirus running on your computer is incompatible or outdated, then you could see this error message. So, the Sophos antivirus has to be updated. Usually, the update happens automatically.
So, when you see a prompt message to update Sophos, click the Upgrade Now button. After updating Sophos, check if the Sophos antivirus is not running issue has been fixed.