Where is the GitHub Download? von JM

Where's the Damn Download? has one purpose: on a github.com repository page, tell the visitor which file in that repository's GitHub release will run on the computer they are using, and say when none of them will.

It detects the operating system and processor the browser reports, reads that repository's releases, ranks the attached files by whether each is built for them, and shows a panel naming one file with a one-line reason.