Portable Catia V5 R21 -

CATIA creates temporary files in %TEMP%, C:\ProgramData\DassaultSystemes, and user application data folders. A true portable app would need to redirect all these writes to the USB drive, which is slower and often impossible due to hard-coded paths in the binaries.

A: Technically yes, using the Windows To Go or VM methods described above. You are not violating the license if you use it only on machines you own or as a single-user license. But you cannot distribute that portable copy. Portable Catia V5 R21

Microsoft’s deprecated Windows To Go (or modern Rufus portable Windows 11) allows you to install Windows entirely on a USB 3.2 SSD (256 GB minimum). On that portable Windows, perform a full, normal installation of Catia V5 R21 using your legitimate license. To use it: boot any PC from the USB drive. Microsoft’s deprecated Windows To Go (or modern Rufus

Result: 100% stable, fully portable, completely legal.
Cost: $100 for SSD + license cost. perform a full