DotNetVersion

If you want to know all the .Net Framework versions installed on your machine, download and then run the DotNetVersion.exe utility.

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Download DotNetVersion (free)

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Instructions

After downloading DotNetVersion.exe, just run DotNetVersion.exe.

DotNetVersion will display a window similar to the following one:


The above result indicates that the machine has the following versions of the .Net Framework installed: 2.0, 3.0, 3.5, 4.0, 4.6 and 4.6.2