Because R21 is an older release, you should use the : Navigate to the extracted folder and find setup.exe . Right-click setup.exe and select Properties . Go to the Compatibility tab.
Find the on your desktop or in the installation directory ( .../win_b64/code/bin/CNEXT.exe ). Right-click the shortcut → Properties → Compatibility .
If you have a high-resolution monitor, click and check "Override high DPI scaling behavior" to ensure the interface looks correct. Common Troubleshooting for Windows 11 Install Catia V5 R21 On Windows 11
Officially, Dassault Systèmes supports V5 releases starting from on Windows 11. Older versions like R21 are not officially certified for Windows 11 but can still function through compatibility layers. OS: Windows 11 64-bit (Ensure it is fully updated).
Extract your CATIA V5 R21 installation files into a folder on your local drive (e.g., C:\CATIA_Install ). Because R21 is an older release, you should
Follow the on-screen prompts for the destination folder (default is usually C:\Program Files\Dassault Systemes\B21 ).
Avoid long folder paths or special characters in the folder name to prevent read errors during setup. 2. Run the Setup in Compatibility Mode Find the on your desktop or in the installation directory (
Check and click Apply . 3. Execute the Installation Double-click setup.exe to begin.
Check and select Windows 7 or Windows XP (Service Pack 3) .
Again, set it to run in compatibility mode for and check Run as Administrator .
