A trial version won't offer all the features available in the full version of the software and when the trial expires, you won't have the possibility to renew it, instead, the user will be prompted to enter an unlock key aka serial number to disable limitations.
Unfortunately, the developers don't sell the application directly through their website, instead, they use partners available for selected regions of the world.
You will have to fill the form to ask them for price or info for a local partner in order to buy the application.