Check our related guides:
Do not extract or install the help files inside the CATIA program folder (e.g., C:\Program Files\Dassault Systemes\B21 ). Instead, create a dedicated location: catia v5r21 help file download
Are you having trouble with a specific when trying to access the help files after installation? Installing the Online Documentation Check our related guides: Do not extract or
Incorrect path in CATDocUrl or missing language subfolder. C:\Program Files\Dassault Systemes\B21 ). Instead