Thanks for sharing your experience with us, tailsswaginn.

The steps shared by the previous representatives should help fix issues when opening QuickBooks Desktop Accountant 2020.

Before performing some troubleshooting steps, you’ll need to verify if your QuickBooks is updated to the latest release to check its compatibility.

Once verified, let’s check if the issue persists in the company file or the program itself. Let me guide you how:

1. Press and hold the Ctrl key while double-clicking your QuickBooks icon. Note that the No Company Open window needs to pop-up before you release the Ctrl button.
2. If it fails to open, you’ll need to check QuickBooks Desktop does not start for steps in resolving.
   
   

If the program starts, you’ll need to verify if only one computer is using your company file. To turn off hosting in other computers, here’s how:

1. From the menu bar, click on File, and select Utilities.
2. Select Stop hosting multi-user access.
   
   

If you’re still unable to open your company file, let’s perform this other troubleshooting steps.

1. On the menu bar, click on File, and select Open or restore company.
2. Select the appropriate button for the file type you want to open.
3. Locate the company file.
4. Click on Open to view company file.
   
   

You may read this article for more information: Resolve Problems Opening QuickBooks Desktop or your Company File.

You can visit our QuickBooks Help Articles page for more insight s about managing your business in your software.

I've got your back if you need more help opening QuickBooks. I'm always happy to lend a hand. Have a good one.