Honestly I can’t answer you, I didn’t build this theme and it’s way beyond my competences …
There i the link the theme -> http://aristotheme.com/
Ok i will do that 
Is that the free theme that you downloaded?
No, I paid for it
I can’t find any documentation for the theme on the website, does that come with the theme? I downloaded one of the free templates for testing, but that doesn’t have any documentation about requirements or how-tos at all.
But anyway, before we go any further, you have to check why rewriting doesn’t work. It is usually enabled on most servers these days.
So, after checking everything I’ve try to restart everything from scratch. So, that’s my bad on OVH shared hosting the root was set to : /. . So I’ve tried to put it in /www and put the .ovhconfig just before the folder www and everything run perfectly.
Thaks you to all for all your responses and your time 