Most Apple users are having the same issue at the moment – the new iOS 13 has changed the way files are downloaded.
Please try these steps and see how you go:
Instead of clicking on the book title to download, please just press and hold. This should then pop up:
Click ‘Download Linked File’.
This will then appear in the download bar at the top of your screen (there is a little blue arrow pointing downwards in the top right hand corner). Click the blue arrow. This will appear:
Click the top URLLink (no matter what number it is).
It will appear as this:
Then click the button in the top right hand corner (an arrow pointing upwards out of a square).
It will give you the option to send it to contacts or open with apps. If the Bluefire/Adobe option does not appear, scroll to the right and select ‘more…’, and you should get a list like this:
If you click on ‘Copy to Bluefire Reader’, or ‘Copy to Adobe Digital Editions’, it will open in the app, and voila! You are ready to read!