Check and set the scaling performed by to Application .
: Use the default installation paths (usually C:\Program Files\Dassault Systemes\B21 ) unless you have a specific reason to change them.
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Installing CATIA V5 R21 on Windows 11 requires specific fixes because this version was released in 2011, long before Windows 11 existed. While it is not officially supported on Windows 11—which typically requires or newer—you can successfully run it by addressing compatibility and dependency issues. Essential Pre-Installation Fixes
Right-click on the desktop shortcut for CATIA V5 R21 and select . Go to the Compatibility tab. Click on Change high DPI settings . Check and set the scaling performed by to Application
How to Install CATIA V5 R21 on Windows 11 (Fixed Guide) Installing legacy engineering software like CATIA V5 R21 on a modern operating system like Windows 11 often results in compatibility errors, sudden crashes, or licensing failures. Because CATIA V5 R21 was released long before Windows 11, the installer requires specific modifications to run smoothly.
Click Next until the installation begins. I need to provide practical solutions to common
Open the extracted folder and navigate to the folder containing setup.exe . Right-click setup.exe and select . Navigate to the Compatibility tab.
When prompted to configure communication ports, keep the default values ( and 30151 ). Click Install to begin copying files. Fixing Common Post-Installation Errors
: Find the CATIA shortcut on your desktop, right-click Properties > Compatibility , and check "Always run this program as an administrator" .