You may have to unzip the file if it comes in a compressed state. (Just double click on it to unzip.) Each BIOS update will differ somewhat but generally it will instruct you how to insert a floppy disk to create a bootable BIOS disk, and then instruct you to shut down the computer and boot it up with the BIOS disk in the drive. This will cause the computer to boot from the floppy disk that will install the new BIOS update.