Fix for existing web page

[login to view URL] I need a fix for this web page that should do the following: 1. When the user lands on the page it will recognise the device. 2. It will show a responsive page with 3 download buttons (linking to 3 different files). 3. If the visitor is on mobile device, the page should AUTOMATICALLY download a file in the background when the page is opened - depending on device. a) If it is a Kindle ebook reader it will download this file, which is the kindle button link: [login to view URL] b) If it is an iOS or Android device it will download here, the epub button link: [login to view URL] 4. And if a user clicks one of the buttons it will download as follows: Kindle: [login to view URL] ePUB: [login to view URL] PDF: [login to view URL] PROBLEM On iOS devices, it is not downloading automatically, and when EPUB is pressed, nothing happens even. What we see is that the user actually has to click the menu option at the top right of the page and then select the link. REQUIREMENT What we want is for iOS devices to automatically download when the page is opened. And also to download if the EPUB or other button is clicked.