Looks like the last release of my unofficial legacy-sigil with XP support was for Sigil v0.9.13 back in March of 2019. I have no recollection of deleting the legacy-sigil repo from my personal Github account, but clearly, I seem to have done that. That last release would have been built with Visual Studio 2013 using Qt5.6.2 and Python 3.4 (Python 3.5 left XP behind). For reference: Python 3.9 reached end-of-life in October of 2025.
Sigil 0.9.13 was about as far as Sigil could have gone on Windows XP. I regret that the repo with its releases was deleted, though. That shouldn't have happened.
The MobileRead thread for my Unofficial Legacy Windows Release is still available:
https://www.mobileread.com/forums/sh...d.php?t=247156