The "Elite" set of bloodlines contains about 50 of only the best bloodlines. Use this for the highest quality and most cohesive bloodlines, and for a more shared experience with other players using Thematic Bloodlines. 50 bloodlines was chosen as a rough estimate of how many bloodlines a player could expect to encounter in a single game, plus a few extra.
This zip file contains two Double Fine pack files, Man_Script.~h and Man_Script.~p. These files are modified versions of what comes with the game. To "install" the mod, you need to replace the files that come with the game with the files that are in the zip file.
For safety's sake, it's probably a good idea to just move the original files aside, rather than replacing them without preserving them in some way.
NOTE: This mod was tested on a Windows machine, with a GOG install. I don't know if it will work on other operating systems, or if the paths are different for a Steam install.
For me, the path to the files is:
Your install directory may vary.
Simply unzip the mod, copy the files into your Packs directory, and start the game.
I expect that using this mod will horribly break backwards compatibility with any old saved games. Start a new game.