win7 內建 IE 11 --->降版到 IE8 再手動安裝IE9

參考來源:How to downgrade IE 11 to IE 10 to IE9 to IE8
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 FORFILES /P %WINDIR%\servicing\Packages /M Microsoft-Windows-InternetExplorer-*11.*.mum /c "cmd /c echo Uninstalling package @fname && start /w pkgmgr /up:@fname /norestart