THE OFFICIAL VERSION
Play from the hosting bot
Joining the bot's game downloads the map it is hosting at that moment. A balance change, a fix, or a new building is already included. A file from an older match, or one passed between players, can be behind the lobby.
STEP 1
Find the lobby
The current game is the one the hosting bot is running.
STEP 2
Take the map from that host
Warcraft III downloads the map from the bot. That file is the newest version.
STEP 3
Pick your role
Seven Base Focusers, three Slayer Focusers, one Vampire.