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Did this convoluted process leave you with a working Logitech mouse, via the unifying receiver? My K750 keyboard works, actually, it's just my M325 mouse that isn't working at all.

Finally got it! Found good help on the logitech site.https://support.logi.com/hc/en-us/community/posts/360036740513-Important-information-for-Logitech-Control-Center-and-macOS-Catalina-Update-LCC-before-installing-macOS-Catalina* First of all, for anyone who *hasn't* updated to Catalina yet, Logitech recommends updating their software first.* If you have already updated to Catalina, go ahead and update Logitech's software too. (I updated both "Logitech Control Center" and "Logitech Options".* If the mouse still isn't working, use "kextstat | grep -i logi " to find your driver version. Mine was still 1.3.8, even though it should have updated to 1.3.9.* If that's the case, rebooting briefly in "MacOS Utilities" (using ⌘R during reboot), and then rebooting normally, somehow causes the proper update to happen.After jumping through those hoops, I have the "com.Logitech.Unifying.HIDDriver" version 1.3.9, and my mouse works.

I just installed Catalina, and I'm having this problem as well.