You can get the Windows version here, or get the MAC version here.
This upgrade deals with an issue that, though rare, can cause vertical lines on an image shot at shutter speeds slower than 8s.
It also stated that when most males hold a Nikon D300 they look remarkably like George Clooney, so if you see a guy who appears to be Gearge Clooney with a D300 duct taped to his hand, it's only me.