If CATIA is already installed but your F1 key opens a dead link, the documentation component was likely skipped. You don't need to reinstall the whole CAD package.
Dassault hosts a public version of the help at: https://help.3ds.com
If you are using a free academic license, you have access to the 3DEXPERIENCE Edu Hub.
Once you have completed the CATIA V5 help documentation download, you must install it correctly. There are two primary methods: Local Help Server (Windows) or Integrated CHM (Compiled HTML Help).
This is the standard method for commercial users. Dassault Systèmes does not bundle the help files with the main installer to keep the installation size manageable (the help files alone are often 2GB+).
The Steps:
If your company uses an HTTP proxy, the documentation server may fail to start. Edit the server.xml file (inside the documentation installation folder) and add proxyHost and proxyPort parameters under the Connector element.
Once downloaded, how do you maximize productivity?
Channels like CATI (Computer Aided Technology), Tecnotron, and GoEngineer produce playlists that mirror help documentation structure. While not as detailed, they cover 80% of basic commands.