Well, that turned out to be easy. Just followed the script to get the scope id, serial number, and model number and edit those into the script. I did as others suggested and upgraded from 70M - 100M, default to factory, then 100M to 200M, default to factory. It now identifies as an 824 rather than an 804. Currently it is running the self-calibration.
One thing that I noticed - in the Acquire menu, I could still only choose 50M as the maximum memory depth (single channel), but when I adjust the horizontal timebase, I see that it is going up to 100M points.
On edit: after rebooting and doing a self-calibration, it is now showing 100M as the maximum option under Acquire - Menu - Max Memory Depth. Interestingly, it no longer shows 50M as an option in this list (when single channel is enabled - of course it drops to 50M when two channels are enabled).
Very cool that this is so straightforward to do. Thanks to those who put together the script and gave instructions!