I'm not sure I understand why you don't want to install the desktop program? You do need to provide an email address but you can always use a "kobo only email address" and keep your private email address private.
There is no necessity to actually USE the desktop other than to upgrade when and if you wish. I have had the desktop installed for over 2 years and only ever use it to upgrade when I want to. I do purchase books from Kobo (using the website kobobooks.com) but I always download the epub into ADE and then into Calibre.
As far as I'm concerned the desktop only exists so that I can upgrade my Kobo if and when I choose.
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