I have Windows 8 and StartIsBack. How do I upgrade to Windows 8.1? Before upgrading to Windows 8.1, ensure you have StartIsBack version 2.0 or above. If you have earlier version you must update StartIsBack. Once you upgrade Windows 8 to Windows 8.1 you must install StartIsBack+. You don't have to uninstall StartIsBack; your settings and license will be kept.