If you manage to install a legitimate copy, ensure your system meets these basic needs to avoid crashes: : High single-thread performance is critical.
There is no official "portable" version of (also known as V5R31) provided by Dassault Systèmes . catia portable 2021
Using unauthorized modifications of software violates intellectual property laws and the Dassault Systèmes End User License Agreement (EULA). If you manage to install a legitimate copy,