To fix QuickBooks update error 12007, you will first have to check your internet connection and rectify the browser settings and firewall program. To check the Internet Explorer (IE) settings, go to the tools section of IE and click internet options, further click security, and click the globe icon, set the security level at medium-high. Now go to the advanced tab, choose to Restore advanced settings, and select Use TLS 1.2 under the settings option. Select Ok to save the settings and restart your computer. These steps will help you fix error 12007 and let you download the payroll or update the QuickBooks application.