If CATIA fails to start or crashes immediately, apply these configuration fixes: Set Compatibility for CNEXT.exe Navigate to the installation directory, typically C:\Program Files\Dassault Systemes\B21\win_b64\code\bin Right-click it, select Properties , and under the Compatibility tab, check Run this program in compatibility mode for Windows 7 (or XP if issues persist) and Run this program as an administrator Licensing Environment Variable
Follow these steps to install CATIA V5 R21 on Windows 11: install catia v5 r21 on windows 11 fixed
Share your CATInstall.log file (found in %temp% ) in the comments below. If CATIA fails to start or crashes immediately,
(set in System Properties):