(try in order):
A common installation error on Windows 11 is the "vc9 runtime problem" message. This occurs because CATIA V5 R21 requires specific Visual C++ redistributables that may not be present on fresh Windows 11 installations. install+catia+v5+r21+on+windows+11+updated
Once CATIA V5 R21 is running, consider these adjustments for the best experience: (try in order): A common installation error on
Windows 11 may lack older libraries. If you encounter errors, install both the x86 and x64 versions of the Microsoft Visual C++ 2008 (VC9) Redistributable Microsoft Learn 2. Critical Fixes for Updated Windows 11 install+catia+v5+r21+on+windows+11+updated
Click and navigate to C:\Program Files\Dassault Systemes\B21\win_b64\code\bin\CNEXT.exe . Once added to the list, click Options .
Check and set the dropdown to Application . This fixes blurry icons on 4K or high-resolution monitors.