I'm not sure this is going to be available again for a while. There were some problems w/ some of the material that was being included.
I suggest you download Archive, a Mac oriented system. http://www.schoolmarmwood.org/Home_files/ARCHIVE.zip
Unzip it and save the various data files to a directory. This will give you much of the same material available in Ocean. Windows users can dump the mac app "Archive". There are ePub files included.
Download DocFetcher, an Open Source desktop search application based on the server oriented Apache Lucene.http://docfetcher.sourceforge.net/en/download.html
Unzip and run it to index the directory with your Baha'i files. It may take a while to generate the initial index, but then any time you add a file to the directory, it is automatically indexed and made available to search. Once indexed, searching is really fast. I have over 10,000 files of various types totaling over 20 gig. Typically, a search takes only a few seconds on a 3 year old entry level MacBook Pro.
IMO, DocFetcher is superior to both Ocean and Archive, esp for very large databases. It allows you to add common word processing files to the existing database plus html and pdf without modification. This means, for instance, you can add the available searchable pdf files of SOTW and Baha'i News for searching.
If you are going to have a large database, I suggest you set up sub-directories for specific searching, such as Scripture, Shoghi Effendi, House of Justice, Compilations, Pilgrims Notes etc.