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/notepad-plus-plus.git
%AppData%\Notepad++\themes(%AppData% is platform dependent environment variable. Open a Command Prompt and execute
Dracula.xmlinside that folder
Settings > Style Configurator
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This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.