Corrupted Installer! - Tried multiple different USB drives; even a new one. HELP

Tried to use Open Core so I can upgrade my 5,1 to Monterey, but I received the following error. Anyone know what to do?

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Corrupted Installer!

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Failed to validate installer, cannot continue.

This can generally happen due to a faulty USB drive, as flashing is an intensive process that can trigger hardware faults not normally seen.

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STDERR: hdiutil: verify: unable to recognize "/Volumes/Install macOS Monterey/Install macOS Monterey.app/Contents/SharedSupport/SharedSupport.dmg" as a disk image. (image not recognized)

hdiutil: verify failed - image not recognized

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