Good morning, everyone. My name is Jessie, and I'm a customer care representative. 'QuickBooks Update Error 404' has gotten a lot of attention. Error 404 occurs when software isn't installed successfully, or when something is contaminated or uninstalled. It's also possible that harm to the QuickBooks database data is at blame. You must log in as an admin. Use antivirus software to scan your PC for harmful files. If nothing works, contact Quickbooks support to resolve the error 404.