: If you are a student, check with your university’s IT department. Many leading institutions have campus-wide subscriptions that allow students to install CATIA on personal machines at no additional cost. System Requirements for CATIA V5 R21

Dassault Systèmes, the developer of CATIA, does not offer V5 R21 as a standard "freeware" product. However, there are several legitimate pathways to access the software:

Before attempting an installation, ensure your hardware meets these foundational specifications for Windows: