You will download two things:

Finding a verified way to download CATIA V5 for free can be challenging, as Dassault Systèmes has largely shifted its focus toward the cloud-based platform. However, there are still legitimate ways for students and professionals to access the software legally and safely. 1. The Reality of "Free" CATIA V5

During special "Back to School" events, Dassault Systèmes often releases promo codes (like the historical CATIA4FREE16 ) that make the Student Edition free for one year .

Check if your school provides a license key or a remote access portal.