update for Mojave

What new update(?) the 10.1.4.5 ?

Try the combo update:

Download macOS Mojave 10.14.5 Combo Update - Apple Support https://support.apple.com/kb/DL2001

Hello Shelob0,

Welcome to the Apple Support Communities. I understand the download for updating to Mojave will stop. You've reached the right place for help.

Here are some steps that can help.

1. The update downloads using the Mac App Store, so be sure to follow these guidelines to insure the connection is good: If you can't connect to the App Store, iTunes Store, or Apple Books - Apple Support
2. Update using safe mode instead if you still have issues: Use safe mode to isolate issues with your Mac - Apple Support
3. If you're still having issues after trying the above, reinstall using macOS Recovery then try the update again: About macOS Recovery - Apple Support

Best regards.