If you are looking for official 10.6 documentation published by the RSA NetWitness Information Design and Development team -- user guides, release notes, installation instructions -- you are in the right place.
List all 10.6 user documentation (HTML and PDF): open the RSA Security Analytics 10.6 Table of Contents
List all documents in PDF format: click the PDFs category
List all guides in HTML format: click the Table of Contents category
List release documents--release notes, installation guides, and update instructions: click the Installation & Upgrade category
View translated 10.6 guides in PDF format: click French, Spanish, Japanese, or German