Just like to update on this download issue. It appears that there is no problem with any of the books I have bought for the K3. You just have to have the wifi on, which I tend to put on rarely, and then the option isn't greyed out, upon purchase. A 'massive' book I bought, 100 greatest novels (33mb)... type thing, that Calibre struggled to open for reading, so I thought forget the old keyboard even attempting that one, until I can split 'em, downloaded in seconds, when I switched the wifi on and opens/works/reads fine.
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