Am I the only one who's not getting any special powers? After installing the mod the only difference from vanilla that I see is that there are minor vampires and just vampires but after I become one I don't get any powers. Haven't tried necromancers or werebeasts yet but can you tell why this is not working. I checked the raws and all the mod files are there.
Check bugs section. First Post. It's a known bug, and it happens in vanilla too, it's just not as noticeable. Try redownloading DF and re-installing whatever mods you have active (for me this bug occurs when I change the raws a LOT when I'm testing things). It seems to only affect ingestion sources for interactions, so if you (for some reason) really don't want to redownload DF, you should still be able to become a werebeast or necromancer (or vampire if bitten by an ancient or a lord). Also, you shouldn't have any regular vampires if you're using one of the preset worldgen files, and regular vampires still have no extra powers. This is because they are generated when the world is made, with no way to adjust their stats and abilities, so if you're trying to become a regular vampire, you're still going to be weak.
Instructions for use are in the readme, and the original post, and the wimbli description. Just use (under advanced worldgen) "FTN <world size>" and it'll remove all the vanilla werebeasts, vampires and necromancers for you.
By the way, if you export the detailed world files, you can get the seeds the worldgen used to make whatever world you have, and use them again to produce that same (or at least very similar) world in the re-downloaded DF.