PowerShell 4 on win7 sp1
https://www.microsoft.com/en-hk/download/details.aspx?id=40855 文件太多了，按照这个http://stackoverflow.com/questions/19902239/how-to-upgrade-powershell-version-from-2-0-to-3-0win764位就下载这个 Windows6.1-...
