Hi @nockemenkes ,
I'm afraid your only option is to contact support for this.
You'll need of a whole bunch of older PAN-OS versions that are no longer supported in order to upgrade your device to the latest supported PAN-OS version for your PA-500 (which is PAN-OS 8.1 btw). You will not find these old PAN-OS versions on the support portal anymore and your best chance is to contact support so they can provide you with the necessary content and software versions from their archive.
Best of luck,
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