Many universities have site licenses. If you are an alumnus of an engineering school, check your university’s software portal. Some institutions still host R21 for legacy courseware.
CATIA V5 R21 is a release of the CATIA V5 software, which is a 3D modeling and engineering solution used for designing, simulating, and manufacturing complex systems. The software provides a wide range of tools and features for creating 3D models, simulating performance, and optimizing designs. catia v5 r21 zip file upd download