Scam - avoid!

Downloaded this app, andhappily paid for some issues of the magazine ... just ... impossible to download them. "unknown error" is all I get. Other users seem to have the same problem, but NatGeo obviously dont care ... just as long as they get your money, they dont care whether you can actually read what you paid for.
Biggest scam I ever downloaded!

UniversalAlien about Nat Geo Magazine International, v1.4