This link points to the FTP service.

ftp://adf.rocks/Maruten (2)/Animations/Understall Undergrads/WIP/

If you have the FTP protocol associated with an FTP-capable app, simply click on the link. Even if this fails, you don't necessarily need to install any extra software — your default file browser (such as Explorer on Windows) can probably handle FTP just fine. For Explorer just copy the link (including the ftp:// part) into its address bar. And if you want a more capable client, use FileZilla or WinSCP.
If your app asks for login credentials, use "anonymous" for both the login and the password.