So I installed Visual Studio 2017 and decided to get it working before uninstalling 2013 and 2015. So done that and was prepared for there to be some issues after doing so. One problem was that .NET Framework 4.5 got uninstalled so I downloaded .NET Framework 4.5 and tried to installed but got the message "Same or higher version of .NET Framework 4.5 has already been installed on this computer."
Is there a way to install it? Its required for a project I am working on with a team and cannot migrate it right now (plus I don't really have the authority to make that decision).
Just to reiterate the target framework is 4.5 and that unfortunately will not change in the foreseeable future.
You need to re-install the 4.5 targeting pack not the framework itself to fix your issue.
You can find it in the individual components section of the VS2017 installer.