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I'm running 10.0.9, which I believe is the RC beta. I haven't tried to download the alpha version.
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Are you using an older calibre? Because 10.0.9 gives an error when trying to add a K4A key from backup.ab on calibre 7.x. But that is fixed in the alpha auto-release of DeDRM.
eta: Not that using an older calibre is neccessarily an issue. People were using this workaround before calibre 7 came out.