During payroll updates, QuickBooks Error 15270 frequently arises as a result of an interrupted or incomplete download. Outdated QuickBooks software, firewall restrictions, or problems with internet connectivity could be the cause. Update QuickBooks, check your internet connection, temporarily disable firewalls, and make sure the payroll subscription is active before attempting the update again. You can reach a member of our QuickBooks staff by calling 1.855.738.2784.