If you use Web hosting with CPanel, Plesk or DirectAdmin , the web statistics package Awstats is usually installed as a default option for all the websites in the package.
However, for some custom hosting configurations , you may have to install it manually for each add on domain and SSH (shell) access is required.
For manual updates, the following link can be used
http://some-domain-name.in/awstats/awstats.pl?config=some-domain-name.in
Most web hosts rotate the traffic log files, so the update should be done before the log files are rotated.