you for reaching out on the community and telling us about your issue. I do
apologize for the issue you're having. I'm wondering here what exactly is causing the issue as it's not an error I've seen before here. To start off the first thing we can attempt here is to sign out and back in to see if that may help us with narrowing down the issue. You can do so by going across the top of your mac and selecting Quicken > Sign out. From there you should be able to sign back into the program as well.
Once you've done so go try updating again and see if you get the same message again. Let us know how it goes!