I currently have audio Librarian 5.0a and 5.5.21 of video librarian. May I update these versions? How?
You can't update any of the mentioned modules because the official website is out of business. I have tried to access it, but a generic search page is displayed instead which means the domain expired, therefore it's impossible to obtain an updated for your application.
Use other applications found through the database search on Software Informer: http://software.informer.com/search/video+library