Thank you!
I just installed it, and it works. Unfortunately, I won't have time to play today.

PS for people who doesn't know how to intsall/play mods (like me):
1) I had to create an empty folder "Mods" there:
C:\Users\*user_name*\Documents\Larian Studios\Divinity Original Sin
2) In this "Mods" folder, I put the dowloaded "xxx.pak" file.
3) In the game menu, I simply chose "Mods", then I selected this mod ("zombie time"), then new game!