Renamed LR catalog and now LR does not load

Renamed LR catalog to 'Lightroom CLASSIC Catalog' in order to later purge non-classic flies in order to clear up HD space.

Used this tutorial to do so: https://www.lightroompresets.com/blogs/pretty-presets-blog/how-to-rename-your-lightroom-catalog

(and yes, I quit LR before performing the above rename)

Now, when loading LR it loads as if I had never used LR before.  Not only are all my files gone, LR itself is a bare slate with none of my presets saved - it's as if I just started with LR.

I still see the 'Lightroom CLASSIC' files saved on my Mac, but when I click them Apple wants me to choose an app from the app store to open said files.  Then, when I click through, it says that app is not available in my country.

Everything is saved in a recent Time Machine back-up to an external, but what just happened and how do I restore LR to it's previous state?

Thanks!