I stopped making official Windows 32-bit installers for Sigil with after v0.9.10. I addition to the extra build time involved, maintaining/updating/testing the results of two toolchains for each Sigil release (plus a third for PageEdit) became quite a slog. "Releasing" became a days long event. Something had to give.
The good news is that I keep the possibility of 32-bit Windows installers alive. All the options for 32-bit builds are still there in the source. I keep hoping that someone will fork the Sigil repo and take over making "unofficial" 32-bit releases.