Last time I cared V5 was "unlimited" for private use but with giant watermarks in the created gerbers. Not actually unlimited by my standards. V6 is just a time limited demo.
V5 asks you to update to V6, so you have to decline the update.
IMHO there never was an unlimited version and having a crappy watermark in your gerbers is actually a much worse limitation than the pin or size restrictions of other free offers.
Anyway, honestly, even without this crap about tricking people into an "unlimited version", I couldn't find much sympathy for the tool. It's slow, it cramped with (partly nonsense) features but the basics don't work as expected. It's slow, it's a drag to use, apparently there are issues with the created gerbers.
Don't get me wrong: the price is very low compared to other offers and I would have happily paid it if I felt I could get used to it and trusted in its reliability. Actually I paid quite a bit more for my non-commercial license of DipTrace.