I've got you covered, TexasRidge.

I'm here to help you install QuickBooks Pro 2020 on your new computer. 

The error you encounter can be caused by one of these reasons:
 

• More workstations are open than the number of licenses you've bought.
• A log file is pinned and the workstations need to be rebooted.
• A firewall is blocking the client workstation from the server.

With this, We'll try some solutions to fix the issue. First, let's verify the number of licensed users. Here's how:

1. Open QuickBooks.
2. Press F2 on the keyboard.
3. Check the number of licensed users in the User licenses row.

If the number of users is less than expected, I recommend contacting our QuickBooks Technical Support to have your account checked. They can verify how many users licensed can access the software. Here's how to contact them: 

1. In QuickBooks, tap Help.
2. Click QuickBooks Desktop Help.
3. In the Have a question? window, choose Contact Us.
4. So you'll be route to the correct support, enter your concern, then hit Continue.
5. Tick either Message an Agent (Chat to a support agent) or Talk to a Specialist (Arrange a callback from a phone agent).

Also, I'm adding this article to further guide you in managing your business's growth using QBDT: QuickBooks Help Articles. It includes topics about account management, banking, and expenses, to name a few. You can also explore video tutorials to help you learn your way around the program.