Hi,
Right now the .jar are uploaded to http://selenium-release.storage.googleapis.com/index.html, but I would suggest to use (not as alternative but as a second possibility) to upload the JAR to the Github Release:
That way we could easily download with:
https://github.com/SeleniumHQ/selenium/releases/releases/latest
or with the Github Releases API https://developer.github.com/v3/repos/releases/#get-the-latest-release
Files can be added via Github User Interface
how does it sound?