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#11
Double-clicking the .iso file Mounts it in File Explorer, useful for exploring its contents and other actions. What is needed is to Burn the image to a disc, usually a DVD-R or DVD+R at about 4GB but if larger would need the DVD+R/DL [Dual Layer] disc at about 8GB. It would use the Burn disc image entry on Properties of the .iso file, usually second on the list under Mount.
Once that DVD is burned it can be booted to and use the USB Image Writer feature in it to create the Bootable USB Drive and using that same .iso file as the Source when prompted.