What Is QuickBooks Error 12029 and How Can You Fix It? QuickBooks Error 12029 is a common issue encountered when trying to update QuickBooks Desktop or payroll services. This error typically occurs due to connectivity issues between QuickBooks and the internet server, leading to failed updates. Below is a detailed explanation of Error 12029, its causes, and step-by-step solutions to resolve it effectively. For immediate assistance, you can always contact QuickBooks Support at (833)200-3695.