Because it doesn't write to the system registry, some plugins or advanced features that rely on Windows services might not work properly.
Windows 7, Windows 10, or Windows 11 (64-bit preferred). Portable Catia V5 R21
Dassault Systèmes does offer an official portable version of CATIA V5 R21. "Portable" versions found on third-party sites are typically repackaged files designed to run without a standard installation. Because it doesn't write to the system registry,
Complex integrations with PDM systems (like SmarTeam or ENOVIA) may not work as seamlessly as they do with a formally installed version. Conclusion Portable Catia V5 R21
Improved curvature continuity (G2) in lofting and styling.