You will download two things:
Warning: Do not pause the download. Use a download manager if your connection is unstable, as corrupted ZIP files are the #1 cause of installation failure. how to download and install catia v5 for free verified
Once you have legal access:
Dassault has introduced lower-cost options like 3DEXPERIENCE SOLIDWORKS for Makers (~$99/year) but not yet for CATIA V5. However, for learning, FreeCAD or Fusion 360 (free for hobbyists) might be acceptable alternatives. You will download two things:
Pros of the Verified Student Version:
Cons: