New Post: EF4.0 does not work Enuns

I did some testing with EF4.5 to use Enuns where I found that this feature only works with Framework 4.5 and not with 4.0, and many still use windows XP where it is not possible to install the Framework 4.5.
So as I'm going to migrate to EF5 or 6 if these new features do not work in version 4.0 of the Framework?
It would be nice to have the option of installing the new Frameworks in windows XP too.