An interruption in the installation process, often brought about by disabled or incomplete Windows Installer components, results in QuickBooks Error 1602. This issue could interfere with software installation or updates. Turn off your antivirus software for a while, make sure Windows Installer is running, and upgrade your machine to fix it. Correct troubleshooting brings back QuickBooks' functionality. Please call us at +1.833.802.0002 if you want to speak with a QuickBooks support professional right now.