Answer:
You can stream Halloween Kills on Peacock Premium beginning on Friday, October 15. You can sign up for Peacock Premium to watch Halloween Kills with ads for $4.99 a month, or you can sign up for Peacock Premium Plus to watch Halloween Kills without ads for $9.99 a month. Both tiers will give you access to the movie. However, you will not be able to watch Halloween Kills on the free version of Peacock.
While there used to be a 7-day free trial for Peacock Premium, unfortunately, it seems the streamer has ended its free trial service ahead of the Halloween Kills release. So you’ll either need to cough up the cash or get a login from a friend.