The installed version is 1.7.
I had 2 sites to migrate in the new host, i migrate the first one (wordpress site) in the "/public_html" and the prestashop site is in a subfolder "/public_html/MYSITE". When deleting the "public_html/.htaccess" file, error 500 let place to a 404 error.
I'm currently washing my tree to have "/public_html/SITE1" and "/public_html/SITE2". I'll come back if my issue isn't resolve after cleaning (probably yes because i had 404 error).
Thanks for your answer.