Gutenberg Pro - Download unlimited bestsellers App Reviews

When trying to download Mathematics books, I keep getting the error: "Unable to download book. Please download book again."

Unable to download anything. Keep getting error message. Dont waste your money!

Its a great app!

Would not download anything.

I was tricked in to buying this app. I will report to Apple and will seek refund. DO NOT FALL FOR THIS SCAM.

Reading other reviews I was skeptical but I got the pro version for free and have downloaded 2 books so far and scanned through to see if they were legit. Seems they are. App has worked as advertised to this point.