Hello, @bmarcum. Thanks for reaching out. I understand how frustrating it can be to encounter an error code after an update, especially when you just want everything to run smoothly in QuickBooks Desktop (QBDT). I’m here to help you get this fixed.

Error codes typically surface when updating QBDT or downloading the latest payroll tax table. These issues can arise from several factors:

• System requirements not being met
• The Shared Download drive wasn't mapped correctly
• A missing file or component for payroll updates
• Damaged windows files
• A firewall setting that may block payroll updates in QuickBooks Desktop
• QuickBooks File Copy Service (FCS) is disabled
• Unable to verify digital signatures

For QBDT 2024 to perform optimally, please ensure you're running Windows 10 with the 64-bit edition. If you need a complete rundown, visit this article: System requirements for QuickBooks Desktop 2024.

To troubleshoot the problem, you can download the QB Tool Hub and run the QB Install Diagnostic Tool. This will help fix common install issues. For the best experience, we recommend you use the tool on Windows 10, 64-bit. Follow these steps:

Download the QB Tool Hub

1. Close QB.
2. Download the latest version (1.6.0.5) of the tool. Save it somewhere easy to find.
3. Open the downloaded file (QuickBooksToolHub.exe).
4. Follow the on-screen instructions to install and agree to the terms and conditions.
5. After installing, double-click the icon on your Windows desktop to open the tool hub.

Run the QB Install Diagnostic Tool

1. Open the QB Tool Hub, then choose Installation Issues.
2. Select QB Install Diagnostic Tool. Let the tool run. It can take up to 20 minutes.
3. After it finishes, restart your computer. Then, launch QBDT and open your data file.
4. Update QBDT to the latest release to ensure you have the most recent fixes and security update. 

For additional troubleshooting steps, check out this article: Fix error 15XXX when updating QuickBooks Desktop or QuickBooks Desktop Payroll.

Let me know if you need additional assistance, bmarcum. I'm always around to help you out. Take care.