Hello , I am interested in playing this game but I only have a mac laptop. I was wondering if the full retail mac version will be free of charge considering I had bought the PC version full price or will I have to repurchase it?
You will not have to re-purchase it. The MAC client is free to use for those that need it.
Read more about it here. Basically you just need to log into your account on the official website and download the MAC client instead of the PC version. That's all there is to it, though you may want to review the hardware requirements.