Spine

Spine is a tool that makes installing and managing mods very easy. However, if you use it to install several extension or conversion mods, things can get a bit dicey, because they can easily end up breaking each other.

In principle, you could use Spine to set up just one extension or conversion mod to not have it interfere with others. In my experience, however, this does not work with the D3D11 renderer (see below) which makes it far less attractive.