You can find download link for premium version inside your
bablosoft account. But there is no difference between free and
premium version. You can continue using free version and you
will be able to use premium features when compilig script by
entering your user/pass, which will alow you to use and compile
script as premium user.
The only thing that will premium version will bring you is integrating
scheduler into compiled script and creating private scripts, but both
features are possible from free version too if you enter premium user/pass.