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Installing vSphere Client 5.1 fails

When installing the vSphere 5.1 client you may encounter the following error message “Failed to install hcmon“, if you look at the vminst.log file (which is normally located in the %TEMP% area) you will notice the following:-


After troubleshooting this issue I found that I required Microsoft .NET Framework 3.5.1 Service Pack 1 installed (or the feature wasn’t turned on) before installing the client.

  • Install Microsoft .NET Framework 3.5.1 Service Pack 1
  • Install the vSphere 5.1 client


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