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Looking at current folder structure :
c:\Windows\Microsoft.NET\Framework -
1. v1.0.3705
2. v1.1.4322
3. v2.0.50727
4. v3.0
5. v3.5
6. v4.0.30319
And on the 64 ver :
C:\Windows\Microsoft.NET\Framework64-
1. v2.0.50727
2. v3.0
3. v3.5
4. v4.0.30319
And here is my question :
I've installed today 4.5.1 :
But I don't see any folder for that version ( nor for 4.5).
If 3,3.5 are built on 2 and they do got special folder ( as you can see) - then why 4.5/4.5.1 didn't get their own folder ? what is so special about the way this version was embedded ?
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NET Framework cannot be uninstalled on Windows 8 and 10. Because of this the preferred method is to repair . NET Framework and to run the System File Checker.
You can get the . NET Framework 3.5 payload files from Windows Update or the installation media in the \sources\sxs folder.
Whether you need any of them or not depends on what you're running. Most applications out there are still built for . NET 2 to 3.5 so installing 3.5 will cover you for that. I would recommend installing 4 as looking forwards that's what Microsoft want people to be using.
Welcome to the big commotion of a year or two ago. 4.5 is a in place upgrade of 4.0, it overwrites files in the 4.0 folder to do the install.
UPDATE: I found this article that states you can still access the overwritten reference assemblies in C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework but those are not the assemblies that are used at runtime on your machine. If you have 4.5 installed a 4.0 targeted assembly will use the 4.5 dll's.
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