QuickBooks Error 15106 While using QuickBooks Desktop Payroll, you often encounter problems while downloading QuickBooks Payroll updates. When you using QuickBooks payroll and you try to unable update then QuickBooks Update Error 15106 can occur. If you are unable to resolve the issue or you find the troubleshooting methods somewhat confusing, you can contact the QuickBooks customer support team and get due assistance. What should we do If QuickBooks Payroll Unable to Update & getting error 15106 . Reach us at 1800-993-4190 QuickBooks Payroll Help Number.