This is just the right place for finding the trial license for the QuickBooks Desktop Enterprise edition, @CRL111.

You don't need any codes to open the trial. However, before installing the QuickBooks trial version, ensure that the system meets the proper configurations to run the QuickBooks Desktop smoothly. Once done, you can now start installing the latest trial version of QuickBooks Desktop Enterprise version. It's just a few steps to install the product. 

Here's how:

1. Go to this link: Download a trial of QuickBooks Desktop.
2. Select QuickBooks Desktop Enterprise 21.0.
   
3. Open the QuickBooks.exe file you downloaded.
   
4. Once the InstallShield Wizard file extraction is complete, click Next.
5. Click Install Trial. 
6. Accept the software license agreement.
7. Choose an installation location, then Next.
8. Click Install.
9. Once the installation is complete, click Open QuickBooks.
10. Choose a QuickBooks Desktop industry-specific edition tailored to fit the specific needs of your business, then Next. Follow the remaining on-screen instructions.

Check out this article for your reference: Install QuickBooks Desktop.

I've also got you an article that might come in handy when you run into trouble installing the software: Fix QuickBooks Desktop install errors.

Keep me posted if you need a hand with running your business in QuickBooks. Assistance is just one click away. Have a great day.