The game is still available. I've downloaded the installation package and registered for an account. I've also created an account and logged on the servers, and there were 11 people playing because I've created an account and then looked for a game.
Use the same URL to download the application: http://www.isc.ro/en/download.html
Additionally, add the game to the Firewall's exclusion list and you should be able to play it.