If you are a git user, you can install the theme and keep up to date by cloning the repo:
$ git clone https://github.com/dracula/plank.git
Dracula folder to
Open plank preferences dialog:
$ plank --preferences
Boom! It's working
Receive updates about this theme and more about Dracula.
This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.