Moon+ Reader not available anymore in appcenter

I bought it several months ago and everything was perfect with application and updates. But today I cannot see it in application list in my apps page of app center. Also a search does not return anything. Other paid applications are okay. So is this problem with app center or with moon+ reader pro application or.... I have problem on two of my devices.
Vladimir

Okay. I have found a reason. Go to the http://moondownload.com/ and do read an author's comment. How it is possible that something like this happens? I know that Google is big but this application has been downloaded so many times in long period that it deserves at least a question or notice before shutting it off.
I am sure that Kafka's Joseph K. would not be surprised at all.