Can't install GameOver edition

[mhgrove]

Hi all, I am a total newbie to Linux so forgive me. I have an old Dell Dimension 8400 on which I am trying to install Sparky GameOver. I am attempting to create a bootable image on a USB but my Dell won't recognize it. I downloaded the image from SourceForge and have used several programs to write the image to my USB stick. USB stick is good. I previously attempted Lakka but I got to the infinite reboot screen so decided to try Sparky.
I have made sure the BIOS on the Dell is set to USB first.
It won't recognize the file.