Update: We haven’t gotten the all clear from Apple just yet, but Audiobook Builder now appears to be downloading and installing just fine from the Mac App Store. Give it a try and let us know how things work out. (This doesn’t address the issue with launching Audiobook Builder on OS X El Capitan, detailed here, but we’re getting very close to submitting 1.5.4 to the Mac App Store now that our sandboxing issues are worked out.)
A bit twist at the Mac App Store has Audiobook Builder failing to properly download and install for most, if not all users. Apple is on the case but haven’t given us a firm timeframe for when to expect downloads to begin working again. We can get you back up and running in the meantime, though. Drop us a line at support@splasm.com, along with a copy of your Mac App Store receipt, and we’ll send a serial number and directions so you can download directly from our site.
Thank you for your patience and understanding!