yeah I also want a bittrex license, where can I get it with the discount if still possible?

Yes, those discount codes are still valid. Send a PM to Gunthar by clicking this link: https://bitcointalk.org/index.php?action=pm;sa=send;u=817682. Just tell him that you want to use a specific code with your purchase, e.g. mine: "GrumpyKitty".

can I use the gunbot for both exchanges or must I buy two licenses?