I had not tested OpenPGP capabilities in my last post for a new account and suggested a followup. I'm doing so here.
Actually it's fairly straightforward. I clicked on my second gmail account (without a key pair ). I went to the options menu, clicked on OpenPGP key manager and selected Generate on the popup window. It was easy to submit the new key request. Interestingly, I'm not prompted for a passphrase. (I am if I want to store a backup copy of my key files.) And then I write a new email choosing Security/Require Encryption to one of my other email accounts, and it's a breeze to read at the other end with the lovely padlock in the upper right.
I do believe that you would have had to install OpenPGP for Windows/Kleopatra. And there are still questions, e.g., why my new key didn't appear in Kleopatra although I seemed to be able to import it into Kleopatra?