2.0 only works with nevada at this time, It's a free update, but the only map that works with it is payware. Once the bugs get worked out it will be merged with 1.5 and you will be able to fly in the black sea map.
so for right now if you don't want to buy NTTR you can just use 1.5.2 :)
(If you bought the a-10c prior to February 21st, 2011 you get NTTR for free, you can get your serial number at the product details page in the E-Shop.)
:)