QuickBooks Error 15271 is a common issue that occurs when updating or installing QuickBooks software. It can be caused by a damaged or incomplete update, a network issue, or an issue with the Windows registry. To resolve this error, you can try restarting your computer, updating QuickBooks again, or repairing your QuickBooks installation. If these steps do not work, you may need to contact QuickBooks support for further assistance at +1-855-948-3646.