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You need to install the version that you need. They are all independent, therefore, if you need to run software under the 2nd .NET and under the 4th, then you need to install both the 2nd and the 4th.
It depends on what version of the framework the application needs. Older versions are definitely not interchangeable
When installing 4, applications written in 3.5 require the installation of this framework.
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