how to join this airdrop. ? Just pm dev ETHD address? right? dont see any information about this airdrop on their thread

Yes, Just send him your ethd address and say that you want to join. That's it.

Is there any way to get EthD address? I don't have windows or Linux machine :/

Then what machine do you have? If you have MacOS, you can download the wallet from here:

http://www.mega.nz/#F!BDgVUCyD!HbWkyrRteXsMlYfqtNWnZg

Lol okay, didn't checked the last page now made account on coinexchabge.

Btw I have mobile named machine lol