Error Code 15240 in QuickBooks typically occurs during payroll updates or when downloading updates. This error can prevent you from accessing important features and functionalities. Common causes include improper internet settings, firewall issues, or damaged installation files. To resolve this error, you may need to adjust your internet settings or reinstall the QuickBooks application. For immediate assistance, dial 1.855.738.2784 to connect with QuickBooks support and receive expert help in troubleshooting and fixing Error Code 15240.