Download the Zip archive:
You can download a zip archive of everything you need.
Download from GitHub:
The canonical version of Superfish lives on GitHub. There you can browse the files, clone, fork and star the project, submit issues if you find them, and so on.
Install via Bower package manager:
If you have the Bower package manager installed, you can install Superfish into your project from the command line by running:
bower install superfish
If you install Superfish using this method only the files you really need are installed without the various project maintenance litter (package.json, etc).
Install via Node Package Manager (NPM):
If you prefer to use NPM, install via
npm install superfish
If your issues are related to styling, try posting your questions to a dedicated CSS forum or Stack Exchange. CSS for Superfish is mainly just traditional Suckerfish-style dropdown menu code so there are plenty of resources out there to learn from.