Private Eye runs on Mac OS X Lion (10.7), Mountain Lion (10.8), Mavericks (10.9), Yosemite (10.10), and El Capitan (10.11).
Sometimes, but very rarely, the installation goes silently wrong because of a bug in Apple's Installer.app. Try running the Private Eye installer again. It solves all problems in 99% of the cases.
Yes, with the separate Radio Silence firewall. Private Eye itself only monitors the connections.
Please contact me, and I'll fix it. The current up-to-date contact information is in the footer of the page. Thanks!
You can simply move the Private Eye application to the Trash. If you want to be thorough and remove all traces of the app, also delete the following file: