As a reminder, Mac software distributed outside the Mac App Store must be notarized by Apple in order to run on macOS Catalina. To make this transition easier and to protect users on macOS Catalina who continue to use older versions of software, we’ve adjusted the notarization prerequisites until January 2020.

You can now notarize Mac software that:

• Doesn’t have the Hardened Runtime capability enabled.
• Has components not signed with your Developer ID.
• Doesn’t include a secure timestamp with your code-signing signature.
• Was built with an older SDK.
• Includes the com.apple.security.get-task-allow entitlement with the value set to any variation of true.

Make sure to submit all versions of your software. While Xcode 10 or later is still required to submit, you don’t need to rebuild or re-sign your software before submission.

Learn more about Developer ID