Disappointing management of legacy downloads

An excellent insight review of Asias economy!
But why in the hell someone has to download again and again editions which have been already downloaded?
I have spent hours to download all available 27+ editions, each of them more than 75MB, only to discover that periodically they are lost! Completely! I havent yet figured out when it happens; whether after updates of the app or due to other unknown reasons.
I like to read the publication offline at my convenience and also to re-read previously downloaded editions!
PLEASE FIX IT ! Then you will get 5 stars!

Logish about Nikkei Asian Review