HDP 2.0.9 includes HDP Stack 2.0.6 and Ambari 1.4.4
The Docs for HDP 2.0.9 are here = http://docs.hortonworks.com/
If you just want the HDP Stack and will perform Manual install, go here = http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-184.108.40.206/bk_installing_manually_book/content/rpm-chap1.html
If you want to use Ambari to perform your install of HDP Stack 2.0.6, go here = http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-220.127.116.11/bk_using_Ambari_book/content/ambari-chap1-1.html
Hope this helps!