QuickBooks Error Code 15270 arises when QuickBooks users try to download the payroll update or setup file. In addition, this error also came into existence when you install the Windows operating system. Due to QuickBooks Error 15270, you may lose your data. So, we will suggest you resolve this error instantly. What are the reasons behind QuickBooks Error 15270 ? QuickBooks has not been updated correctly. If the network connection is not set up properly. When the server communication is blocked by a firewall or anti-virus. If the Windows program is infected or corrupted.