Sometimes it is packaged as part of the bundle. If you cannot find it immediately, use the search bar with the exact term: “documentation” or “help” followed by your release number.
Yes. Unlike open-source software, CATIA V5 is proprietary. You cannot legally download the help documentation without either: catia v5 help documentation download
: Choose V5 and specify the release year (e.g., V5R20 or V5R21) and the level (typically "Golden"). Sometimes it is packaged as part of the bundle