Hello, @mathieu Fontaine,
I am sorry but the htaccess file has been generated by the server and WP, so it’s better to contact WordPress support for it, if your hosting is not able to help you, it does not have any link with our theme.
You can check this article as well: https://help.dreamhost.com/hc/en-us/articles/215747748-How-can-I-redirect-and-rewrite-my-URLs-with-an-htaccess-file-
And try to reach out to WordPress support.
Thanks for your understanding.
Regards 8Themes Team.