The CRACK/patcher will be flagged as "HackTool:Win32/Keygen". Temporarily disable:

If you see "No available license", check:

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".

On Windows 11 — Install Catia V5 R21

The CRACK/patcher will be flagged as "HackTool:Win32/Keygen". Temporarily disable:

If you see "No available license", check:

CATIA R21 expects OpenGL 2.1 but Windows 11's native driver translation is slow. Install Catia V5 R21 On Windows 11

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".