An alternate Homebrew Cask tap for installing Bumptop. Unfortunately the official open source project is mostly dead, and their last official release doesn't work on newer versions of OS X.
However, before they closed their commercial site, there was a newer release which does still work, with some minor glitches on some OS X versions. This alternate tap makes use of that release, and will be available as long as it continues to work.
brew tap thehunmonkgroup/homebrew-bumptop
brew cask install bumptop