Hello Grace1181,
For help with updating your macOS for use with third-party applications, test the steps below found in the article here: Update macOS on Mac - Apple Support
"Use Software Update
Before following these steps, it's a good idea to back up your Mac.
- From the Apple menu in the corner of your screen, choose System Settings or System Preferences.
- If you chose System Settings, click General on the left side of the window. Then click Software Update on the right.
- If you chose System Preferences, click Software Update in the window.
2.Software Update then checks for new software.
- If Software Update finds new software, click the button to install it. The button might be named Update Now, Upgrade Now, Install Now, or Restart Now, for example. You might then be asked to enter your administrator password.
- If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model. Software Update shows only software that is compatible with your Mac."
You can also find helpful information here: Keep your Mac up to date
If you continue to have an issue test updating while booted to safe mode. Start up your Mac in safe mode
Cheers.