This is the released public beta for Element TD 4.0. It is fully functional, but keep in mind that much will change for the final 4.0 release.
a) Install Warcraft 3 (Reign of Chaos).
b) Install Warcraft 3 expansion (The Frozen Throne).
c) Patch Warcraft 3 to most recent version (1.22).
d) Download the file and put it in your Warcraft III\Maps\Download\ folder.
e) Start Warcraft.
f) Click singleplayer->custom game->choose your map->press start game.
g) If you want to play online/multiplayer-> press BattleNet and sign up
for an account->click the custom games button-> either host
yourself or find a game in the list.