Hi! As far as we know, if you buy the latest version at full price (without discount), you will get the next update for free.
You will get cheats additionally, as they cost less than the price you pay for the version.
Is the full price 6USD now for the windows version?
It's 40% off right now, so no, $6 isn't the full price. However, we often discount and when a new version comes out, it will be discounted sooner or later and you can get access to it
