Open the , type Turn Windows features on or off , and press Enter .
If you're new to CATIA or don't need the extra performance, choose the 32-bit version.
: Alex encountered a "setup" error. He learned he had to ensure the Microsoft Visual C++ 2008 Redistributables (both x86 and x64) were present, as modern versions like 2017 could sometimes cause conflicts.
Are you running a dedicated workstation GPU like an , or a consumer gaming GPU? Install Catia V5 R21 On Windows 11
Modern graphics card drivers (NVIDIA/AMD) conflict with the old OpenGL implementation used by V5 R21.
Navigate to Settings > Windows Security > App & browser control and disable Smart App Control . Restart your computer before launching CATIA again.
Because CATIA V5 R21 was not built natively for Windows 11, you may encounter specific errors during your first launch. Issue 1: "Click OK to Terminate" Error on Launch Open the , type Turn Windows features on
Review the installation summary and click . The process may take 10 to 20 minutes depending on your hard drive speed.
CATIA will not fully boot without locating its license server or local license keys. Launch CATIA V5 R21 using your modified desktop shortcut.
Windows 11 64-bit (Note: Version 24H2 has reported stability issues; 23H2 is preferred). Permissions: You must use a local Administrator Security Settings: Temporarily disable Windows Defender He learned he had to ensure the Microsoft
using command line if the GUI doesn't respond:
Define the localhost connection ( 127.0.0.1 ) if the server is running on the same Windows 11 machine. For Legacy LUM Licenses