During payroll or software updates, QuickBooks Error 15103 happens frequently as a result of improper setup or corrupted files. Successful updates are blocked, and alerts such as The update program is damaged or The update cannot be opened may appear. It can be fixed by verifying digital signatures, internet settings, and, if necessary, reinstalling QuickBooks. Do you need help using QuickBooks? For expert assistance, call 1.855.738.2784.