Install Catia V5 R21 On Windows 11 -

CATIA R21 expects OpenGL 2.1 but Windows 11's native driver translation is slow.

Edit environment file: Go to C:\ProgramData\DassaultSystemes\CATEnv\CATIA.V5R21.B21.txt and add:

CATGraphicWarnings=no
CATUseVBO=yes
CATDisplayZis=no

Inside CATIA: Tools → Options → General → Display → uncheck "Software OpenGL".

Set these to avoid profile corruption:

Create those folders manually.

Yes, if:

No, if:

Performance outcome: On an average Windows 11 laptop (Intel 12th gen, 16GB RAM, RTX 3050), CATIA V5 R21 runs at ~85% speed compared to native Windows 7 – perfectly usable for part design, basic assemblies (<200 parts), and drafting. Install Catia V5 R21 On Windows 11