Easy to use (Gui Win) Version Control Software

Easy to use (Gui Win) Version Control Software

I'm in search for a friend who studies economic science for an easy
Version Control Software. For the moment he needs it for his thesis which
has to be written in LaTeX. Since he has to learn LaTeX too (and he has
enough problems with it) the VCS should be easy to use - at best with Gui
for Windows. He is the only one who has to use the VCS.
A few years ago I used a VCS for the same purpose, but I can't find it any
more. It was a bit like Git. It made in the working directory a hidden
directory where it stored it's information.
I tried to teach him Git, but he said it is to complicated (I only use Git
on command line and don't know any good Gui's) with his thesis and LaTeX.
Is there a good Gui for Git or an easy to learn/use VCS (it should be free)?
Thanks