Windows 11 Fixed: Install Catia V5 R21 On

certutil -addstore "TrustedPublisher" "C:\path\to\your\CATIA_setup.exe"

Windows 11 high-DPI scaling often makes CATIA icons look tiny or blurry. install catia v5 r21 on windows 11 fixed

(set in System Properties):

Don’t just double-click the setup file; follow this specific sequence to avoid registry errors: go to the Compatibility tab

Right-click setup.exe , select , go to the Compatibility tab, and check "Run this program in compatibility mode for Windows 7 ". install catia v5 r21 on windows 11 fixed