QuickBooks Error Code 12029 arises when upgrading software and denotes a network timeout because of connectivity problems. It can be caused by erroneous internet configurations, firewalls that prevent QuickBooks from opening, or erratic network connections. To fix this error, make sure your network is stable, check your internet settings, and configure firewall permissions. Contact our QuickBooks Experts Team at 1.855.738.2784 for immediate support.