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Thanks for reaching out to the Community, @debbie61.
Since you've already mentioned that Enterprise 20.0 is already installed, we can prep your company file.
Below are the steps to prep your original company file:
Now, it's time to upgrade your company file.
After you've completed the steps above, you can now open your original file in your new version.
Also, for more detailed instructions with upgrading your file, you can refer back to this article as well: Upgrade your company files after switching to a new version of QuickBooks Desktop.
Let me know if the steps above do the trick. If you have any more questions or concerns, please don't hesitate to comment below.