There could be many reasons that lead to QuickBooks error 12007, and the primary one is mis configured system files, which causes registry error in the operating system. The QuickBooks error 12007 is one of the most common errors that users face. It can also occur when the user cannot connect to the Internet or due to antivirus or firewall problems. There are different ways to fix update error 12007, and some of them are given below. 1. Firstly, you will need to resolve the internal QuickBooks related issues and errors. It can be done by upgrading your computer's operating system to the latest version and the QuickBooks desktop. 2. Afterward, you will need to check the network stability using the internet literacy test. 3. Make sure that you have set internet explorer as your default browser, as QuickBooks works best with IE. If you are still facing the problem, you must start windows in safe mode and networking.