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/nylas-n1.git
Download using the GitHub .zip download option and unzip them.
Open N1 and install the theme by going to
Nylas N1 > Install New Theme... and selecting the directory.
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.