Thanks for getting in touch with the Community, Mark. I've got the steps to ensure you can update your QuickBooks Desktop (QBDT) account.

Beforehand, may I know which year version of QBDT you have? Knowing this would help us address the issue further. If you see a black screen when you try to activate your account, your antivirus software might be in the way. I suggest turning off your antivirus software and try updating it again. You can turn it back on when done.

However, if you're not asked to enter your validation code, you can manually update your account. I'll show you how to open a manual activation window.

1. With QuickBooks open, press Ctrl+P on your keyboard.
2. Enter your validation code.

If you still can't enter your validation code, please follow these steps:

1. Go to Help, Manage my license, then Change my license number.
2. Enter the license number as all 0s.
3. Don't enter the validation code and then select Finish.
4. Go to Help, Manage my license, then Change my license number.
5. Enter your license number. When prompted, enter the validation code and select Finish.

Additionally, if you're having a specific error while updating your account, refer to this article for a complete guide: Fix activation, license, and product numbers issues in QBDT.

We're always here to help you whenever you have other concerns about updating your account. Feel free to comment below.

I need my license number for reinstalling

Welcome to the Community, kginnh. To get your QuickBooks Desktop (QBDT) license number, you can sign in to your account at camps.intuit.com to see your details online.

If you bought a CD, check the original packaging or the materials inside the box for the codes.

On the other hand, for direct purchases from Intuit, look for a confirmation email in your inbox, including spam or junk folders.
 

Feel free to reply to this post if you need more help with your QuickBooks account. 

@kginnh 

Which QB Desktop year version? 2024 or older?