You need to pay for it if you intend to use it; it's not donationware. It's developed by one man, not a big company with lots of resources.
As good as free then.
I have the full version and paid for it. Im just saying you can download it for free with full feature and no time limit for now if you want to try it out.
Only thing is it says unregistered in the title bar. Ive never seen a nag screen when I had the eval version