While using QuickBooks Desktop Payroll , you often encounter problems while downloading QuickBooks Payroll updates. You might see “Error 15106: The update program cannot be opened” or “Error 15106: The update program is damaged”. This issue can be resolved by verifying why the access to the updates have been denied. What is QuickBooks Error 15106 about? When the user attempts to do QB Desktop updates, if the process is not completed successfully, then QuickBooks Payroll update error 15106 is displayed. Error 15106 implies that the updates are not accessible. QB errors like 15106 make it difficult for users to execute routine tasks and therefore disrupt regular workflow activities. What are the possible reasons for the error to occur? The main reasons for QuickBooks error 15106 to occur are: Problems caused by the presence of Spy Sweeper in the web root antivirus application. Limited user access due to the type of user login. Restricted user access without administrative rights can prevent important activities like reading / writing of system files.