When the program is unable to access a network location while being installed or updated, QuickBooks Error 1606 appears. Incorrect registry settings, corrupted system files, or invalid user profiles are typically the cause. Repairing registry pathways, updating Windows, and making sure the machine is configured correctly for seamless QuickBooks operation are all necessary to fix this error. Call 1.855.738.2784 if you need help with QuickBooks.