Remove update notification for macOS Catalina 10.15 - Mac System Preferences
If you do not want to upgrade to macOS Catalina 10.15 in the near future, you can remove the System Preferences upgrade notification (red badge) for it.
1. Go to System Preferences -> Advanced and uncheck check for updates, Download new updates when available, and Install macOS updates.
2. Open Terminal and type the following commands to remove the update notification from System Preferences.
This command will disable updates for macOS Catalina:
sudo softwareupdate --ignore "macOS Catalina"
This command prevents the red notification badge in System Preferences:
defaults write com.apple.systempreferences AttentionPrefBundleIDs 0
This command will reset the System Preferences icon:
If you decide later you want to include macOS Catalina 10.15 updates again, type the following command in Terminal:
sudo softwareupdate --reset-ignored