Well I had a look at the web page and this is what is say the patch will alter. There is not a lot of other information. other than a change log page.
Availible Firmware Alterations:
D3100 Remove Time Based Video Restrictions Change Time Based Video Restrictions to 17:28 Non-brand Battery D3200 Remove Time Based Video Restrictions - DOES NOT WORK CORRECTLY D5100 Remove Time Based Video Restrictions NEF Compression Off NEF Compression Lossless NEF Oversampling, to allow testing by Astro folks - BETA Jpeg Compression - Quality (vs. Space) Non-brand Battery D7000 Remove Time Based Video Restrictions ALPHA support for NEF oversampling, to allow testing by Astro folks - ALPHA
You don't even download the tool, its a web based silverlight tool that you upload your firmware and get back a modified firmware. For more information visit Nikonhackers webpage. I do not have any camera that could be modified so I have not tested this and of course, its your own risk.