DoubleDealingDiap!!! After inciting me yesterday to make a fresh build of Sigil from Master on Github, here is an Appimage which just works by download and double-click.!!

I downloaded both Sigil and PageEdit Appimages and they run fine on my UbuntuStudio24.04.2LTS box.
Sigil looks identical to the build I made yesterday from Master. In brief testing I can't see any difference between the Appimage and the regular build of Sigil.
I'd been meaning for some time to have a look at PageEdit but I've never really felt an urgent requirement. I'm generally happy working in Sigil's Code view or if I need an HTML editor, there's always Bluefish Editor.
I've parked both Appimages rather untidily on my Desktop for the moment and I've managed to open PageEdit by right-click on the xhtml file in Book Browser and selecting Open With --> PageEdit.
I'll look closer at what I might want to do with PageEdit a bit later.