We need to get the installer signed, so until then you may get an "unidentified developer" message. Here's the workaround:

In the Finder, locate the Applications | BibleWorks icon.
Press the Control-key, then click the app icon.
Choose Open from the shortcut menu.
Click Open.
The app is saved as an exception to your security settings, and you will be able to open it in the future by double-clicking it, just like any authorized app.