Unzip it, rename the folder "Dracula"
Move it to
File -> Preferences -> General Settings -> IDE skin -> Dracula -> Apply. If the skin does not show up in this list, try restarting gms2, and make sure the theme is installed at the correct location (it needs to be
..\Skins\master\Dracula, for example)
If the text doesn't look right (letters have different widths), see troubleshooting below
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.