Thanks so much for responding, Peter. All the song files and the rendered M4a files were created with BIAB 2015 for Mac created on a Mac mini running Yosemite. My phone is a brand new iPhone 6 plus running iOS 8.4 (12H143) which, according to auto update is the latest version. I also have 4gigs of memory left, so it shouldn't be a storage issue. The one song within the linked folder that successfully downloaded is "A Kiss To Build A Dream On". When I've uninstalled then reinstalled the app, that song will again download and save, but no other, regardless if I try a single song, a range of songs, or a zip file with everything. The result is always the same: the songs will show up in the directory listed in green; I select the song or songs or zip file, click "save selected" then select the folder to which I want to save the song/songs (and it makes no difference whether I choose the root folder or a created folder); I click "save", it pinwheels for a second if one tune, or a very long time if I select the zip files (during which it counts down the percentage of loading). If it's a single tune, after the second of pinwheeling the app crashes. If it's the zip file when the loading registers 100% it will pinwheel for a few seconds, then crash and close. I have gone through this process many, many times now, always with the same results. Here is the link to the Dropbox folder with all the song and rendered audio files: https://www.dropbox.com/sh/ag0kwc4rzdrl5qz/AACtWQD9z8UEON99-FDxFyYia?dl=0 Your timely attention to this is much appreciated as my intention to use this app on the gig was one of my motivations for upgrading to 2015 and for getting the plus size phone rather than the regular iPhone 6 as my wife did. This will save me from having to take my laptop to the gig, yet still be able to see the chord chart as it progresses through the tune so I can find my place if I get lost (which seems very easy for me to do when I don't have real musicians there with whom to communicate). Thanks again.