New version has been released. For AppStore build the main change is workaround for sandboxing bug that bit updating users. New users should not be affected by it. I also squeezed smallish change: new option to enable/disable file sorting.
Also some changes in non-AppStore build: abbinder has been included in GUI bundle. Add symlink and you’ll always have up to date version of command line utility:
ln -s /Application/AudioBookBunder.app/Contents/MacOS/abbinder /usr/local/bin/abbinder. Thanks to Keenan Brock for suggestion