This is Counter-Strike 1.5 for Half-Life Retail (WON). Google it, and you will be able to play this with other people.
I did not produce this and have no claim on its copyrights. World Opponent Network, it's the old server host for the original 1998 Half-Life until in later years Steam was born and WON died after.
It is therefore highly advised to keep up with the latest version.
There are two ways to upgrade Presta Shop: The automatic upgrade simply uses the free 1-Click Upgrade module.
If not, ask your host to update the server configuration.