Fixed - Install Catia V5 R21 On Windows 11

Legacy software relies on specific C++ redistributable packages. Download and install both the x86 and x64 versions of Visual C++ 2008 (VC9) and Visual C++ 2010 (VC10) directly from the official Microsoft support page to prevent start-up errors.

Right-click the CATIA shortcut created on your desktop and select . install catia v5 r21 on windows 11 fixed

High-DPI scaling conflicts on modern high-resolution screens. install catia v5 r21 on windows 11 fixed

Launch the setup.exe . Proceed with the default installation paths (typically C:\Program Files\Dassault Systemes\B21 ) and click "Yes" when prompted to create new environment directories. install catia v5 r21 on windows 11 fixed

Navigate to Tools > Options > General > Display > Performance and lower the or turn off hardware acceleration.