You can download a free trial of ArcGIS 10.3 from the official Esri website. Although it might not be in French, you can use the software for a limited time to assess its features.
Instead, I can offer you some alternatives: i--- Telecharger Arcgis 10.3 Francais Avec Crack Gratuit
Esri offers various subscription plans and licenses for ArcGIS. You can explore these options to access the software legally. You can download a free trial of ArcGIS 10