How to download a WSP file from the Farm Solution Store

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[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.SharePoint”)

    $farm = [Microsoft.SharePoint.Administration.SPFarm]::Local

    $solution = $farm.Solutions["uiframework.wsp"]

    $file = $solution.SolutionFile

    $file.SaveAs(“D:\wsp\uiframework.wsp”)

http://blog.claudiobrotto.com/2011/how-to-download-a-wsp-file-from-the-farm-solution-store/

Default master set using powershell

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$web = Get-SPWeb http://gsshyd-dt-5765:1111/

$web.CustomMasterUrl = "/_catalogs/masterpage/v4.master"

$web.MasterUrl = "/_catalogs/masterpage/v4.master"

$web.Update()