The traditional CATIA V5 Student Edition is no longer available online for direct purchase. Students are encouraged to use the cloud-based 3DEXPERIENCE CATIA for Students System Requirements for CATIA V5
Let me know which you actually need:
Here is a practical story and guide based on the landscape of that time: The Story: Upgrading the Setup
Acquiring CATIA V5 R21 (2021) via legitimate channels ensures legal compliance, technical integrity, and vendor support. Unauthorized downloads pose significant legal and security risks; organizations should follow vendor procedures, leverage academic programs where eligible, or adopt alternative CAD tools if appropriate.
This article provides a guide on how to officially acquire and install the 2021 release of this industry-leading CAD/CAM/CAE software. Understanding CATIA V5-6R2021 (R31)
I know it is tempting to find an old "R21" ISO file. It was a stable release... in 2011. But in 2025, installing R21 on a modern PC is a security nightmare and a driver headache.
Released in 2021, this is the version intended for current operating systems and modern hardware. Official Download and Installation