I was searching for the old copy of mastercam and come across one thing, I mean mastercam only provide support upto 5 generation and if you doesn't upgrade or renew to new version than after 5 generation you have to purchase new licence copy to get benefit of current version. Means X6 user can not directly upgrade to 2018.........., so what i am thinking what if person purchase the 2018 version and other person wants the old version lets say the x6 because he like the old interface and only do 2D stuff. So what is the suggestion you can give to the other guy?