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The latest version of Dota is 6.66. You can download it from www.getdota.com.
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
You can download DotA at getdota.com. That's the official site for updates. You can also download the AI versions there, as well as view the changelogs, which will tell you everything that has been changed since the previous version.
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.
Steve Feak (AKA Guinsoo),then Eul improved dota,then after.. icefrog is now developing dota