Hello, Sherryadski.

Let me share some information about R6 patch. It is the current release version of QuickBooks Desktop 2021.
When you install the R6 update patch, there are some changes on your QuickBooks but it doesn't update your company file.

Here's how to check if you have R6 patch:
 

1. Open QuickBooks Desktop.
2. Press F2 (or Ctrl+1) to open the Product Information window.
3. Check your current version and release.

I've also included this article for additional information about Release notes for QuickBooks Desktop 2021.

I'm also adding this article that tackles maintaining your software up-to-date, so you always have the latest features and fixes: Update QuickBooks Desktop to the latest release.

Let me know if you have additional questions in managing your QuickBooks. I'm always here to help.