Prereqs:
(run powershell commands from here) : http://www.enterprisenetworkingplanet.com/datacenter/Installing-Exchange-2010-Step-by-Step-3877601.htm
Grab these files:
http://www.microsoft.com/en-US/download/details.aspx?id=40779 (.NET 4.51)
http://www.microsoft.com/en-us/download/details.aspx?id=17331 (KB974405-x64)
http://www.microsoft.com/en-us/download/details.aspx?id=17062 (Office 2010 filter pack)
http://thehotfixshare.net/board/index.php?autocom=downloads&req=download&code=confirm_download&id=12354 (KB982867-v2-x64)
http://thehotfixshare.net/board/index.php?autocom=downloads&req=download&code=confirm_download&id=12136 (KB977020-v2-x64)
http://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=29092 (KB983440-x64)
http://www.microsoft.com/en-US/download/details.aspx?id=16335 (KB979099-x64)
http://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=27109 (6.1: KB979744-v2-x64 )
Also, don't forget SP3 http://www.microsoft.com/en-us/download/details.aspx?id=36768 (just run it from command line:
C:\Admin\ex2010sp3>setup /mode:upgrade /installwindowscomponentsand UR5 http://www.microsoft.com/en-us/download/details.aspx?id=42001 .