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.NET Framework 3.5 is not installed out of the box in Windows 8. I found that this version is still required for a handful of applications and it must be installed. The "check the box" method within the Windows 8 GUI did not work for me so I needed to find another way to get it installed. I found an MSDN post that explained it. In short, easiest way that I found to get .NET Framework 3.5 is by following the below steps:

  1. Open a "cmd" prompt by browsing to the "C:\Windows\System32\", find the "cmd.exe" icon and right click, choose "Run as administrator".
  2. In the cmd console type "DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs" replace the "d" in "/Source:d:\sources\" with the drive letter that corresponds with your DVD drive, your mounted ISO, or if you run into difficulties with this, copy the entire contents of your sxs directory from your DVD to your local drive and change the path accordingly.
  3. Execute the command and confirm success.
That was it. After I preformed the above steps I could install and run my .NET 3.5 applications without issue.

user Posted by John "Mike" Wright

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