Hi John,
Well the 2.0 is a beta-test version, that means that it may be a little buggy for teaching use. We make it available to our 1.0-1.2 registered users for digging out the very last deeply buried bug we didn't find by ourselves. :lol:
Anyway, you can also buy the 1.0 version, then freely update to already released 1.2, then freely upgrade to 2.0 when released... Well, it's up to you!
Hope this enlightens you.