help me about this game

Solution
no you can't
but there are some Dota2 modified that you can play on lan party or ai bots, i think its illegal to modify game even its free to play
if you want ,you can play warcraft3 there are still dota maps there
dota2 modified? i cant simply recommend you to download it, besides its fun to play with community.. and i dont know where to download it

for warcraft3 frozenthrone goto torrent sites, i think its ok to download it because its free to play
and for maps getdota.com