That is up to DiapDealer. Recent versions of Qt have stopped trying to support Windows XP, and Microsoft has abandoned Xp. The real issue is that there have been a large number of Sigil bug fixes in each of the last 7 releases since 0.9.1 that fix serious bugs, many of which have remained hidden since even Sigil 0.7.4 days. I have no idea if Sigil 0.9.8 can be made to run on Xp or not.
Have you considered trying to run Windows 7 on that box? Or alternatively run Linux on it?
I have many older Macs that can't run new versions of OSX running Linux just to keep them useful to run print servers or act as a firewall bridge, etc.
Unfortunately, there is no long run future solution for Xp for anything using Qt (and that includes Sigil) that I know about.
As for support, we can try to help where possible but you will probably stumble into many of the bugs we have already fixed as time goes by. Perhaps Diapdealer can let us know the status for Xp support on Windows for the latest Qt 5.9.1 which I would like to upgrade to for the next release to hopefully get as many Qt bug fixes as possible into Sigil.
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