Dear Rob,
Possible update Book Library Basic 2.x version to Book Library Pro without lost data following our documentation.
ordasoft.com/upgrade-instructions-book-l...la-elibrary-solution
You can try make the same steps for your version, but first make all that on test website or you can contact us via contact form and ask about customization service for update Book Library.
Best Wishes,
Taras
OrdaSoft team