"No Installers Found"

Hi, I'm the student technical director for performances at my school. I'm attempting to update my ETC ION running v1.4.0 to v2.4.0. I downloaded the .zip file (then unzipped it), and put in the root folder of a M-DOS (FAT32) formatted flash drive. I turned the console off, plugged the flash drive into the back of the ION, turned it on, and attempted to update the software but it said "No Installers Found." Am I doing something wrong?

Thanks!

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