I want to have the DirectAdmin version of Awstats

Firstly, if you have an AwStats plugin, that is not ours, this guide does not refer to the plugin. They're 2 different things.

AwStats for DA is mentioned here

To install it, you login to ssh as root and type:

cd /usr/local/directadmin/scripts
./awstats.sh

See the above versions entry for more info on this feature.