Why would it make sense to have a "Download from Github" button instead of a "View me on GitHub" button or something?
It of cause makes sense for closed source software, but being open source it invites in people who at the very least want to read the `README.md`, star the repo and most likely want to have a look at the source code.
I kind of panicked when the download button actually downloaded - I was like "hey stop! wait a sec! I want to check out the code first" - maybe it's just me ;)