Leap 15.3 is not on that site yet. And although openSUSE Tumbleweed has Sigil 1.7.0, the Leap distros all only provide Sigil 1.2.1 (inherently). You have to enable a communities repository to get Sigil 1.7.0 on openSUSE Leap 15.2/3.
I don't know all the particulars, but I'll try it out when I get back home to my dev machine.
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