If you already have Illustrator CS6 installed but it is in English, you can often "force" a language change by modifying the support files.

: C:\Program Files\Adobe\Adobe Illustrator CS6\Support Files\Contents\Windows .

Méthode 1 : Remplacement Manuel des Fichiers de Langue (Le Patch Fr)

Right-click the Illustrator icon in your Applications folder, select Show Package Contents , then go to Contents/Resources . 2. Identify the Language Folders