This project has been inactive since at least 2015. While the kernel extensions kept working for a few OS X releases, with Apple requiring notarization and moving away from kernel extensions in general (which is a good thing!), this project is no longer relevant.
Old releases are still available until further notice in case they are helpful. If you really need the kernel extensions on more recent operating systems, you might try the notarized kernel extensions provided by the Tunneblick project: https://github.com/Tunnelblick/Tunnelblick/tree/master/third_party