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Mac OS10.15 Catalina - Remove from Quarentine
To get around the verified developer thing, you can do this:

• Open a Terminal window and enter: sudo xattr -r -d com.apple.quarentine <path to plugin file>and press return
   (you will be prompted for admin password)
   The file path can be entered by drag/dropping the plug-in file in the terminal window.

OR

Mac OS10.15 Catalina - Gatekeeper Disable
To use any Unverified Developer software, you can do this:

• Close System Preferences (if open)
• Open a Terminal window and enter: sudo spctl --master-disable and press return
   (you will be prompted for admin password)
• If you open System Preferences/Security & Privacy
   You’ll see that the Open Apps From: "Anywhere" button is now available and selected
• Launch Illustrator - All plug-ins should load.

To turn Gatekeeper back on, in a Terminal window enter: sudo spctl --master-enable and press return - or, open System Preferences/Security & Privacy->General, unlock and select App Store and identified developers button and close prefs.
To check status: sudo spctl --status

If you turn Gatekeeper back on, you’ll get the Unverified Developer warning again.