Of course, you must have Warcraft III, The Frozen Throne.
STEPS:
1. Update WC3 to the latest version. Either by
I. from the Main Screen >> Battle.net
II. download patcher via
http://us.blizzard.com/support/article.xml?locale=en_US&articleId=20673
2. Download DotA map via
http://www.getdota.com
3. Place your downloaded DotA map in you wc3 folder.
Probably
- Code:
-
C:\Program Files\Warcraft III\Maps\
3b*. Might want to create a Dota folder inside \Maps\
- Code:
-
C:\Program Files\Warcraft III\Maps\DotA
4. Play DotA!
*Optional