Logos crashing on startup. Any ideas?

I restarted Logos because an update (38.0 beta 3) was dowloaded, but it crashes on start up now with the following error:

---> System.TypeInitializationException: The type initializer for 'Libronix.DigitalLibrary.Documents.DocumentManager' threw an exception.


---> System.TypeInitializationException: The type initializer for 'Libronix.DigitalLibrary.Documents.BibleStudy.BibleStudyDocument' threw an exception.


---> System.IO.FileNotFoundException: Could not load file or assembly 'Logos.BibleStudyBuilder, Version=3.6.0.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.

I fear it may be because I lost my beta license for the subscription features which includes "BibleStudyBuilder". Anyone know a quick fix?

(BTW, my first try at this post disappeared when I edited it and got on error submitting it.)