Hi and welcome to the forum:
Oddly, this sounds very familiar and I could swear there is an almost identical post somewhere, but whatever...
As per the instructions, you must download a compressed version of the update file to a computer and unpack it. If you are using a Windows computer, you need to run the Winzip file to unpack and reveal a file with an .FIR extension. On a Mac, I believe this is done transparently. You copy the FIR file to the root directory of a cleanly formatted, full-size SD card and install that in the camera. When you initiate the firmware function, it should then see the update and allow you to complete the process. Make sure you have a fully-charged battery for this and follow the instructions on screen.
cheers, TREVOR
"The Amount of Misery expands to fill the space available"
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris
