Umm, it seems there are two different payment pages. I first clicked on the Heart icon in Calibre, and it went to a page as described above -- PayPal only (or so it appears). When I clicked on the Support Calibre button on the User Manual page, it went to a different place where I was able to do something as a Guest. (Of course, when I got done, it said, "This isn't working right now, try back later." So I'll try again later.)
Now that I'm through griping, THANK YOU very much for Calibre! I love it.
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