The bot costs 0.1 BTC with one license, for either Poloniex, Bittrex or Kraken. If you want to have 2 license, I think each costs 0.05 each.
It is 0.1 BTC for 1 licence, and then 0.05 BTC for another exchange. Therefore, if you wanted to buy Gunbot for all 3 exchanges it would cost you a total of 0.2 BTC (or 0.18 BTC with my referral code).
i have bought polo licence two months ago, and now i wanna try bittrex, i wanna know the price is it 0.05 or 0.1??