I'm going upload to the app store two versions of my game : one free and one paid , is there any way to put a link to buy the paid game from the menu of the free game ?
Yes there is a way. If you have GS pro, you can open urls in your game. Hope this helps!
Thanks very much
You could also just build it to use an in app purchase to unlock the full paid version since you have pro. That is the more desirable method these days.