I apparently had Lightroom open but computer in sleep mode when electricity died. I thought it had corrupted the catalog file that was opened, but I can't get a different catalog to open either. Seems like it's the program itself that's corrupted.
I'm wondering if I should download a new copy of Lightroom Classic (assuming I can).
Yes, of course you can. In the Creative Cloud app you have the option to uninstall, and then to install. I would first try if resetting the preferences solves this. It's more likely that they got corrupted than the application itself: https://www.lightroomqueen.com/how-do-i-reset-lightrooms-preferences/
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