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/godot.git
Download using the GitHub .zip download option and unzip them.
cat 'OBTAINED_PATH/theme.tres' >> 'GODOT_PATH/editor_settings-3.tres'
$HOME/.config/godot if installed from Godot
$HOME/.steam/steam/steamapps/common/Godot Engine/editor_data if installed with Steam
Get-Content 'OBTAINED_PATH\theme.tres' | Add-Content 'GODOT_PATH\editor_settings-3.tres'
$env:APPDATA\Godot if installed from Godot
C:\Program Files (x86)\Steam\steamapps\common\Godot Engine\editor_data if installed with Steam
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This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.