It shows this message, that its verificating that I'm a human for about one second
Viewing post in Fapello.Downloader 3.6 - NSFW image/video downloader comments
Mh, that s probably why the app does not work for you and for some others, in your country Fapello.com is blocking "web scrapers" (software like FapelloDownloader).
In my country this message does not appeare and the app can reach Fapello.com without problem.
I am sorry for this problem, i am working to fix it, i hope i can.