CCS/TMS320C6713B: how can I download and install the ccs v6 and guide me how to install and what options to choose and what not in installing process

All CCS versions are available for download from the below link:

http://processors.wiki.ti.com/index.php/Download_CCS

Why are you interested in v6? It is an older version. I would recommend v7, unless you are using BIOS. Then you may want to use v5 instead.

If installing v6, you will want to make sure you install device support for C67x:

Thanks

ki