As always, grab the newest version on codeplex: http://bepuphysics.codeplex.com/
In addition to the regular upgrades, this version comes with updates to the previously available SlimDX fork.
Don't want to use XNA or SlimDX? No problem! There's now a dependency free version as well! The BEPUphysicsDemos project used to test the dependency-free library still relies on XNA, but the library itself is completely independent.