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System Extension Block Message with High Sierra 10.13

when installing mac software downloaded from bc

When installing Sophos for the first time on a Mac with High Sierra 10.13 or higher, you will get an extension block alert after installation (see Figure 1).

Figure 1.
Figure 1.

If you get an alert like this (see Figure 1), do the following:

  1. Within 30 minutes after installing Sophos, open System Preferences.
  2. Double-click Security & Privacy.
  3. On the General tab, click Allow next to "System software from developer 'Sophos' was blocked from loading." (see Figure 2)
Figure 2.
Figure 2.