开发WP 8.1应用程序需要Windows 8.1或更高版本如更新2（RS）下载的系统要求中所述：

To develop WP 8.1 apps you need Windows 8.1 or higher as noted in the system requirements for the update 2(RS) download:

对于Windows Phone 8.1开发：

For Windows Phone 8.1 development:

• Windows 8.1（x86）或更高版本

http://www.microsoft.com/en-us/download/details.aspx?id=42307