Welcome to the Community forum, @Phyllis S.

Thank you for asking this question. It's my top priority that you get the necessary update without losing any of your QuickBooks data.

Before doing the steps for the Microsoft update, be sure to save your changes/work first on your QuickBooks Desktop. Any information entered may disappear if the changes aren't saved. Once done, create a backup copy of your file just in case. 

Here's how:

1. Log in to QuickBooks in single-user mode or go to the File menu and select Switch to Single-User Mode.
2. Click the Back Up Company option under the File menu.
3. Select Create Local Backup and choose Local Backup.
4. Click Options and select where you want to store your backup.
5. Tap the OK button and then click the Next button.
6. Choose the Save It Now option and click the Finish button to begin the backup process.

Once you're done with the update, you can check your company file if the most recent information is there. In case it isn't you can restore the most recent backup to prevent data loss.

Please let me know if there's anything else I can do to ensure your success. Thanks for coming to the Community, cheers to an awesome rest of the day.