We just released Undercover 4.5. This update makes Undercover fully compatible with the yet to be released Lion (Mac OS X 10.7). In addition, the new version improves location tracking on Snow Leopard and Lion.
Undercover 4.5 is compatible with Tiger, Leopard, Snow Leopard and Lion. You should install it on all your Undercover-equipped Macs. Simply download the installer from the Undercover page and run the installer.