How to allow install of non app store or identified developers on MacOS Sierra I'm getting this error trying to install software on MacOS Sierra (10.12.5):

Your security preferences allow installation of only apps from the App Store and identified developers.

I'd like to change the settings so that these types of installations are allowed. Similar to what is shown here:

http://www.synergy.com/wordpress_650164087/faqs/if-you-get-the-following-error-trying-to-install-kg-under-os-10-8-your-security-preferences-allow-installation-of-only-apps-from-the-mac-app-store-and-identified-developers/

However, my system doesn't seem to have the Anywhere option (screen shot below). This option is also not available if the Advanced button is selected.
From: How to Allow Apps from Anywhere in macOS Sierra Gatekeeper


Quit  out of System Preferences

Open the Terminal app from the /Applications/Utilities/ folder and then enter the following command syntax:
sudo spctl --master-disable


Hit return and authenticate with an admin password

Relaunch System Preferences and go to “Security &amp; Privacy” and the “General” tab

You will now see the “Anywhere” option under ‘Allow apps downloaded from:’ Gatekeeper options