I updated to Sequoia this morning because QB was sending a message that it had to be done.  Fine, no problem, but when I went to install the update I keep getting this error message:  

The update is improperly signed and could not be validated. Please try again later or contact the app developer.

Not sure what this means.  I am not a developer, just a simple bookkeeper, and I need this to work.  Thoughts or do I need to contact QB?