Warcraft2.online offers a free Warcraft II client called War2Combat which lets you play on our server.
All you have to do is install, run, & connect to the server to start playing online! The latest version & installation guide are located here.

In addition to Warcraft II we also provide a variety of related downloads to help improve your gaming experience, including utilities, map packs & replays of matches.

Also you can manually browse the file storage to see all the files available for download.

File search result (Classic Multiplayer Campaign.7z):

Classic online     499.90 KB	A classic Warcraft II campaign for two players in co-op online mode. Works only on our server	Forum topic