NIDAQmx version numbers

Hello all again,

I have a bunch of brand new NI devices which come with a NIDAQmx DVD version 9.9 dated 10 months ago. But if I do a search on NIDAQmx to get the latest, I find a version 14.1. I find it strange that it would have gone up so many versions in less than a year. Are those two different things or should I get the 14.1 ?

Thanks.