I've just installed earthdesk on my macbook, but has this big sign on the center ''Not licenced, evaluation use only''?

Because you’re using the trial version. You haven’t bought it.

And how much it is?

Yes Elumas is correct that is the trail version. Don’t bother buying it, trial works just fine.

On their product page it’s listed for $24.95 that you can purchase online. Once you purchase it they will send you a code that you enter somewhere in the program that will ‘unlock’ it. Clear instructions will accompany the purchase.

@sanbuu Regardless of whether the trial works without purchase or not, people buy software to get full functionality and/or to support the programmer. If you like it and purchase it, you’re funding further development of a cool piece of software.

@ artificiallarrrrd, yes that’s well there are trail versions. So you can test it out and go from there. I got rid of it within the week, and I still say the trail offers a good adventure for a while.