Defense of the Ancients cannot be installed, as it is a map, not a separate game.
First, you need to have Warcraft III: The Frozen Throne (Expansion pack. You need Warcraft: Reign of Chaos to install it)..... Then download the version of DotA you want. After downloading, go to C:\Program Files\Warcraft III, or wherever you've chosen to install the game, and then copy the map you downloaded and paste it into the Maps folder. You're finished then, but be sure you have the World Editor for DotA. You can download it from websites, but some CDs have map editors included. After downloading or pasting the map, open all the folders and find the "BNU (Battle.net) Update", and then click it. After the update, copy the BNU Update, paste it to the folder you placed DotA in, and you're done. Just run Warcraft III: The Frozen Throne, go to single player, then custom game, and you'll find the map in the menu at the top.
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Two sites have very good info on unprotection and both have downloadable versions of DotA Allstars that are unprotected/deprotected: DeprotectDotA http://en.wikipedia.org/wiki/User:DeprotectDotA and Open DotA http://zibada.xgm.ru/opendota/index.php
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password is: bosnianboy2323
Click the all games at the top left of steam,you will see the dota2 in there
There are a number of places where someone can access a free DotA map. Some website examples include Get DotA, DotA-Utilities, Softpedia and DotA Source.