QuickBooks update errors can occur due to various reasons, such as internet connectivity issues, firewall settings blocking the update, or corrupted QuickBooks installation files. To troubleshoot:

1. Check Internet Connection: Ensure you have a stable internet connection. Try restarting your router and reconnecting.

2. Configure Firewall and Antivirus: Make sure your firewall or antivirus isn't blocking QuickBooks. Add QuickBooks as an exception in these settings.

3. Use the QuickBooks Tool Hub: Download and run the QuickBooks Tool Hub. Use the "Program Problems" option to repair the installation.

4. Run QuickBooks as Administrator: Right-click on the QuickBooks icon and select "Run as Administrator" before attempting the update again.

5. Rename the QBWUSER.INI file: This resets the settings, which might resolve the error. The file is located in the QuickBooks installation directory.

If these steps don't resolve the issue, you might need to contact QuickBooks support or consult a professional for more advanced troubleshooting.