Full version?

I BOUGHT this app and when I try and open certain sections to review before a test it tells me to purchase the full version if I want access? Isnt that what I initially paid for? What did my money go towards if not the full version of the app... It was good until this little mishap, get this sorted out and Id be more inclined to give it more stars.

AssHat_ about Calculus FTW - Deep Insight into Solving Calculus Problems