People are perfectly welcome to post walkthroughts and one of the ones in the game is exactly that, fan made by a forum member Capacitor. If people post other walkthroughs I will add them into the game as I did with this one.
The fix is posted earlier in this thread, a few pages back, but briefly
Download
You must be registered to see the links
Install
copy into your game installation and unzip here not into a subfolder. Merge any folders and overwrite any files
The Vampyre event with Sarah, to survive you must
a) give her the book
b) have a magical defence
Otherwise visit Gina's home without her and cast Clairvoyance/Pass