I found the first part of video a bit confusing - now remember, computers , there is many ways of doing same thing.
I do same with either Windows 7 or on my Ubuntu system-
- save firmware to download file (do not open or run)
-right click on saved compressed file and extract to same download folder
-then just drag it to your USB drive
If you download it to and extract it to same folder, you do not loose where it is!!