This is not true, at least not for the mac version. It said it was the unlicensed free version but after it said the trial expired it will not play mp3, and says we have to get the paid version in order to play them.
I had the older version on another machine so we transferred it over and are using that, but they really shouldn't say the free version plays mp3 when it does not. On the web page it doesn't say anything about the free version being only a trial and it says the free version plays mp3.