Unrelated to the product itself, please make pricing/licensing clear upfront. “Try for free” leads to a page that says “signing up is free”. Great, but what comes after that? Please don’t leave your users guessing.
You make a valid point, there is a completely free version actually, but you can also try the paid version 14-days for free. After signing-in you can choose the free plan or the trial, but I get your point, you might feel like you are running in some sort of trap. Maybe we could make a link to the pricing page there to make it more clear.
PS: I also work at Marple