Hey! You will want to use: https://docs.oracle.com/javase/6/docs/api/java/net/URL.html in order to make a request.
If the content is Base64 encoded, you can use: https://developer.github.com/v3/repos/contents/
Otherwise, you may need to use: https://developer.github.com/v3/repos/releases/#get-a-single-release-asset to get the assets from the release.
You may also want to check out: https://github-api.kohsuke.org