I'm having the same problem (iOS 9.3 beta 2) although it worked fine yesterday (OSX whatevernumberthelatestpublicreleaseis), but I'm unclear whether this is due to my device or the downloader being temporarily down. Would appreciate clarification as if it's down I won't start fiddling with settings and shall be patient!
► SUPPORT AUTHORS. BUY THE BOOK.
Always click THANK YOU on releases
Jan 2023 onwards: I am permanently unable to reupload books I released; please report dead links to mods
Always click THANK YOU on releases
Jan 2023 onwards: I am permanently unable to reupload books I released; please report dead links to mods