How to detect if the .NET Framework Platform Update 1 is installed


Go to Control Panel / Programs / Programs and Features / View Installed Updates

Use the Search Box to search the updates for


Or if you prefer, search the list your self

Microsoft .NET Framework 4 Platform Update 1 - Runtime Update

  1. Look for .NET Framework 4 Extended
  2. Look for Update for Microsoft .NET Framework 4 Extended (KB2478063)
  3. Click on the Help Link to see what you get with this update


Microsoft .NET Framework 4 Platform Update 1 – Design-time Package for Visual Studio 2010 SP1 (KB2495593)

  1. Look for Microsoft Visual Studio 2010 (<Your Edition) – (<Language>) (KB2495593)
  2. Click on the Help Link to see what this update contains


Look in the registry for the following keys

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NET Framework\v4.0.30319\SKUs\

.NETFramework, Version=v4.0.1

.NETFramework, Version-v4.0.1, Profile=Client

Ron Jacobs
Twitter: @ronljacobs

Comments (2)

  1. Victor.Woo says:

    After installed theVS10SP1-KB2495593.exe, and switch my WF ActivityLibrary project to target ".NET Framework 4 Platform Update 1(KB2478063), many of my code prompts the error:

    Module 'mscorelib, Version, Culture=neutral, PublickKeyToken=b77a5c561934e089' should be referenced

  2. Ron Jacobs says:

    Victor – you should log an issue at

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