Getting a legitimate download of CATIA V5-6R2012 (historically known as V5R22) requires valid commercial or educational licensing from Dassault Systèmes. As an older release, it is primarily accessed through the official support portal or via authorized resellers. Official Download Channels
If you need V5R22 specifically, you have three legal pathways. Catia V5 R22 Download
Since V5R22 is officially discontinued, you cannot "buy" a new license from Dassault resellers. However, you have three viable options: Catia V5 R22 Download
A minimum of 4 GB, though 8 GB or more is highly recommended for assembly work. Catia V5 R22 Download