This is grasshopper repository. Most of these GH files are built with Hops so you don't need to download it. You just need to copy the raw url into your script.
Please Check Hops for installation information.
In Rhino command Line type PackageManager
. Then Search for "Hops" and click install.
Adder_hops.gh - Example file tto create a Hops component and Github integration.