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.

If you cannot get CATIA legally and need similar CAD software for free:

| Software | License | Similarity to CATIA | |----------|---------|---------------------| | FreeCAD | Open source | Parametric modeling, good for beginners | | Fusion 360 | Free for hobbyists/students | More user-friendly, cloud-based | | Onshape | Free (public documents) | Professional cloud CAD | | Salome | Open source | Based on same kernel as CATIA (Open CASCADE) |

CATIA V5 is old software disguised in a new GUI. You must tweak Windows: