"Failed to prepare the software update" during upgrade attempt

This is a first for me, I've had my system running fine for several years and always gone through minor & major updates without an issue. Until today.

After ensuring my OpenCore was current (0.8.5) along with kexts, I backed up my machine to Time Machine and attempted to upgrade from Monterey > Ventura via Software Update. After spending some time downloading the installer I always get "Failed to prepare the software update. Please try again". Trying again doesn't help.

I...

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