Mount your CATIA ISO or extract the zip files to a local folder. Run as Administrator: Right-click the file and select "Run as administrator" Compatibility Assistant:
After installing CATIA V5 R21 on Windows 11: install catia v5 r21 on windows 11 fixed
LEGACY (or the path to your license server). Common Troubleshooting Tips for Windows 11 Mount your CATIA ISO or extract the zip