Click to begin copying files. This process may take several minutes.

Check the box at the bottom for . Click Apply and then OK . Step-by-Step Installation Process

: Upon first launch, a black command prompt appeared, declaring the application was now "HighDPI aware" . This was Windows 11’s way of ensuring the interface didn't look blurry on high-res screens.

Install the Microsoft Visual C++ 2005-2012 Redistributables , as R21 relies on these older libraries.

: CATIA uses this folder to store user environment configurations (CATEnv files). The default path is generally located within C:\ProgramData . Click Next to confirm. Step 3: Select Setup Type

8 GB minimum; 16 GB or higher is recommended for complex assemblies.

Before starting, ensure your system meets these baseline needs for a stable installation:

(both x86 and x64 versions). Many installation failures on Windows 11 are caused by missing these specific legacy runtimes. Run as Administrator

The native Windows 11 installer engine often rejects the CATIA V5 R21 deployment script. You must force the executable to run in a legacy environment. Locate your CATIA V5 R21 installation media directory.