If you want to watch horror movies this October and subscribe to the Criterion Channel, I can't recommend enough the Pre-Code Horror collection. Some absolute classics in there. If I had to recommend one, it would be The Old Dark House.

https://www.criterionchannel.com/pre-code-horror

Pre-Code Horror - The Criterion Channel

With their startlingly perverse themes, lurid psychosexual undertones, and often-grisly violence, the horror films made in the early 1930s before the enforcement of the Hollywood Production Code still have the power to shock. Unbound by any concessions to family-friendly morality and influenced b...

The Criterion Channel