Unfortunately I'd say you were hoodwinked.
The full game will come out on Aug 1, which is only two weeks away.
Your purchase will be completely obsolete by then. Nobody will discuss it. Nobody will want to use it, since a thousand little things will have been tweaked. (Heck, it was obsolete already six months ago, given the six or so patches that happened during the playtest)
Unfortunately it isn't even a good start or a good introduction either - you've purchased a playtest, a beta; if anything, the final rulebook should add the newbie-friendly language they didn't bother with for the playtest.
Also, the playtest was free online but also was published. Which a year ago was kind of reasonable. You'd use it to follow along in the public playtest process that happened last fall. Now? Selling the playtest document is a rip-off.