The newest build of EventScripts 2.0 includes support for the es_install console command. This allows you to download and install approved scripts from the addons.eventscripts.com from your console.

This allows admins to automatically download and install any approved addon from addons.eventscripts.com. For example:

es_install gungame4 autoload

would automatically download and install the latest GunGame 4.0 and load it on the next server restart.

You can grab this latest release over here or much more info can be found on the forums.