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I have an existing web app using a combination of MVC and WebForms on .NET 4.0. I want to upgrade to 4.5 to take advantage of some new features in EF 5 (which require 4.5). A couple of questions to hopefully prevent breaking the live site:
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Just like with previous versions. In fact, 4.0 uses completely different directories to store its assemblies in. Uninstalling will prevent you from using older programs. It is however possible to run 2.0+ software using the 4.0 runtime, with some extra configuration in the application config file.
Support for . NET Framework versions 4.5. 2, 4.6, and 4.6. 1 ended on April 26, 2022, so security fixes, updates, and technical support for these versions will no longer be provided.
NET Framework 4.5 (or one of its point releases) runs side by side with versions 1.1, 2.0, and 3.5, and is an in-place update that replaces version 4. For apps that target versions 1.1, 2.0, and 3.5, you can install the appropriate version of . NET Framework on the target machine to run the app in its best environment.
If you created your app using an earlier version of . NET Framework, you can generally upgrade it to . NET Framework 4.5 and its point releases (4.5.
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