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Question

• CLO doesn't run with a warning about an unverified developer's app.
• CLO app doesn't work when I click the CLO app in the launchpad.
• When I try to run the CLO, I see a warning that it is malicious software.

Answer

• Since the release of macOS Catalina, Apple has changed the macOS policy to:
  
  • About the security content of macOS Catalina 10.15
  • Change Security & Privacy General preferences on Mac
• Learn how to run CLO with pictures and descriptions below.

Workaround 

Simply click the “Show in Finder” then RIGHT CLICK and select Open.

It will give you a similar Error, but OPEN will be an option. Just Click Open and you should be fine.

1) If you can't run CLO on macOS as shown below:

2) Click the 'Show in Finder' button, or open the Mac Applications folder.

3) Control-click the app icon, then choose Open from the shortcut menu.

4) Click Open.

The app is saved as an exception to your security settings, and you can open it in the future by double-clicking it just as you can any registered app.

References

• Open a Mac app from an unidentified developer
• Find out which macOS your Mac is using