If you are having many errors with Book Creator after updating to the new version, it might be best to uninstall the software and then do a clean reinstall.
For the Mac version, open your Application folder. The easiest way is to choose GO from the Finder and choose APPLICATIONS.
Then drag the folder that says A&I Book Creator to the trash.
Next, download and install the newest version by clicking HERE Make sure to DOWNLOAD A NEW COPY, Don’t install something thats even a day old.
Remember that your projects are saved to a different location, more info HERE