Datto RMM: Error: "'CAG.pkg' can't be opened because Apple cannot check it for malicious software"



RMM fails to install on macOS Catalina with the error message, "'CAG.pkg' can't be opened because Apple cannot check it for malicious software."


  • Datto RMM
  • macOS Catalina


If an App does not come from the App Store, Apple automatically runs a scan to make sure it is not malicious. Apple cannot run the scan on our Agent Installer.


cag1.pngFigure 1: Error message (click to enlarge)

1. Click OK.

2. Navigate to System Preferences → Security & Privacy → General.

3. Click Open Anyway.

cag2.pngFigure 2: General tab (click to enlarge)

4. Click Open again.

cag3.pngFigure 3: Error message (click to enlarge)

5. Click Continue to install the software.

cag4.pngFigure 4: Agent installer (click to enlarge)

You can also right-click CAG.pkg and select Open to bypass the error. 

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