install framework 4.5

Can I install framework 4.5 without updating 4.0?  I want both exist on my server.
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Russ SuterSenior Software DeveloperCommented:
Why? Framework 4.5 is fully backward compatible with 4.0.
Dave BaldwinFixer of ProblemsCommented:
This version of the .NET Framework runs side-by-side with the .NET Framework 3.5 SP1 and earlier versions, but performs an in-place update for the .NET Framework 4, .NET Framework 4.5 and .NET Framework 4.5.1.

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JohnBusiness Consultant (Owner)Commented:
You should be able to click in Windows Features (Programs and Features) to install .NET Framework 4.5. I am not sure (depending on the server if you may first need to install Windows Experience. I don't think so.
MisbahSr. Software EngineerCommented:
answer is no ,
 .NET 4 and 4.5 share the same base
.NET 3.5 and 2 share the same base
so you only can have these two bases running side by side.
Jacques Bourgeois (James Burger)PresidentCommented:
You can't, and anyway, there is absolutely no reason to do that. Applications compiled for 4.0 will run exactly the same way in 4.5.

4.5 simply brings updates, new classes and new possibilities in the framework. Asking to have both is like asking if you can have Visual Studio 2013 and Visual Studio Update 1 on the same computer.

If this is because you need to code for 4.0, you can do it even if 4.5 is the one installed on the development computer. Simply to into the project's Properties window and set 4.0 as the target framework. Visual Studio will automatically hide the newer features when you work in that project, and it will mark it for 4.0 when you will compile it. The application will thus be recognized as a 4.0 application and will be able to run on any computer that has framework 4.0 or more installed.
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