We have changed the version numbers of the SpecFlow Visual Studio integration to avoid confusion with the SpecFlow runtime versions. You have just installed Visual Studio integration v2015.1 that supports SpecFlow runtime v1.7 or later (the runtime is installed through NuGet for each project individually).
This Visual Studio integration now supports Visual Studio 2015 as well as Visual Studio 2013. Visual Studio is supported in all editions except for “Express”. Note that there is now also a free Visual Studio Community edition that is supported by SpecFlow.
You can find more about using SpecFlow with Visual Studio 2015 here.
Please help us and the other users by rating the package on the Visual Studio Gallery page!