Hi there, @lmuetzel.

I appreciate you for providing me with that clarification. The option to update the clients' files all at once isn't available. You need to install the latest release to each company file.

Additionally, you can see this prompt if the update is not complete. Thus, you need to download the release manually, then install it to update the file. Make sure you're in single user mode, and the file is not over the network.

Since the automatic update is set up in each client's file, you can also turn off the pop-ups in QuickBooks. This way you won't see the notification once the new release is available.

Here's how: 

1. From the Edit menu, select Preferences.
2. From the Preferences window, select General on the left column
3. Go to the My Preferences tab.
4. Check the box next to Turn off pop-up messages for products and services. 
5. Click OK.

For additional reference, the following article contains information about the recent changes, improvements, and fixes for you product: Latest release available for QuickBooks Desktop 2019.

In case you need tips and related articles in the future, visit our QuickBooks Community help website for reference: QBDT Self-help. 

Let me know if you have further questions. I'll be happy to help you out.