You sound like a Mac OSX user. Presently both the above & the links on the first page are still working.

Normally as soon as you have finished downloading the DMG file will automatically open (mount on the desktop). Double-click the installer inside of it. Sometimes the installer is slow to open.

To use this version of LimeWire, you must be using OSX 10.6 Snow Leopard, OR using an intel computer & at least OSX 10.5 Leopard.