1Fort

On your Mac, choose Apple menu  &gt; System Settings, then click Privacy &amp; Security  in the sidebar. (You may need to scroll down.)

Go to Security, click the pop-up menu next to “Allow applications downloaded from,” then choose the sources from which you’ll allow software to be installed:

- App Store: Allows apps only from the Mac App Store. This is the most secure setting. All the developers of apps in the Mac App Store are identified by Apple, and each app is reviewed before it’s accepted. macOS checks the app before it opens the first time to be certain it hasn’t been modified since the developer shipped it. If there’s ever a problem with an app, Apple removes it from the Mac App Store.
- App Store and identified developers: Allows apps from the Mac App Store and apps from identified developers. Identified developers are registered with Apple and can optionally upload their apps to Apple for a security check. If problems occur with an app, Apple can revoke its authorization. macOS checks the app before it opens the first time to be certain it hasn’t been modified since the developer shipped it.

1. On your Mac, choose Apple menu &gt; System Settings, then click Privacy &amp; Security in the sidebar. (You may need to scroll down.)
 
2. Go to Security, click the pop-up menu next to “Allow applications downloaded from,” then choose the sources from which you’ll allow software to be installed:
 - App Store: Allows apps only from the Mac App Store. This is the most secure setting. All the developers of apps in the Mac App Store are identified by Apple, and each app is reviewed before it’s accepted. macOS checks the app before it opens the first time to be certain it hasn’t been modified since the developer shipped it. If there’s ever a problem with an app, Apple removes it from the Mac App Store.
 - App Store and identified developers: Allows apps from the Mac App Store and apps from identified developers. Identified developers are registered with Apple and can optionally upload their apps to Apple for a security check. If problems occur with an app, Apple can revoke its authorization. macOS checks the app before it opens the first time to be certain it hasn’t been modified since the developer shipped it.