I am using a 2019 MacBook Pro. I am moving from macOS 10.14.6 to macOS 10.15 Catalina.

I just finished downloading the macOS Catalina installer via Software Update System Preferences pane, but when I try to install it, I run into an error as follows:

enter image description here

I have also downloaded macOS Mojave security update. What can I do to resolve and install macOS Catalina?

  • 1
    How much of empty disk space do you have in Macintosh HD? Try checking using Disk Utility.
    – Nimesh Neema
    Commented Aug 5, 2020 at 15:57
  • @NimeshNeema 300Gb Commented Aug 5, 2020 at 16:01
  • Take a look through this thread, you may find something that resolves the issue: discussions.apple.com/thread/8552490
    – Nimesh Neema
    Commented Aug 5, 2020 at 16:10
  • @NimeshNeema I've done them all but still the same Commented Aug 5, 2020 at 17:14

1 Answer 1


There was a known issue with upgrading Macs with a T2 chip, such as yours, to macOS 10.15.6. Apple have yet to acknowledge the problem but have rolled out (about 3 hours ago) a new update to the software catalog that is reported to fix the problem.

Give it another try now.


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