Yeah it can be a bit tricky to follow. Looks like HairWorks got an update 5 days ago, but appears to still be 4.10 only. Hopefully when they upgrade to 4.11 they will append the UE4 version to the branch name like they have for the others.
Yes you need Visual Studio 2013 or 2015 to be able to compile the source code. The community edition is free and is all you need.