You really have to like this sort of film...
Or you will find little of value here. It's the first of four Mexican horror films from 1961-62 featuring German Robles as the son of Nostradamus, who is a vampire. I've only seen the version that K. Gordan Murray dubbed into English, so maybe it's better than I think but this is definitely a film that would only be improved if Santo or Blue Demon showed up.
The ending is particularly hopeless and I'm guessing that this was actually part of a serial rather than an independent feature.