When the program is unable to access a network location during installation or upgrades, QuickBooks Error 1606 occurs. Incorrect Windows registry settings, corrupted user profiles, or inaccurate folder paths are typically the causes of this problem. Repairing registry entries, updating Windows settings, and making sure installation permissions are correct are all necessary to fix the error. If you need help with QuickBooks, give 1.855.738.2784 a call.