Specifically, I'm looking to find out which is the latest SN version which used the traditional/ancient illustrations of the constellations, and also to know whether that version would run on WIndows 11.

Please Starry Night here: https://astronomy.starrynight.com/starry-night-8-professional-astronomy-telescope-control-software.html

Comparison chart is here: https://astronomy.starrynight.com/starry-night-8-comparison-chart.html

Starry Night 8 is the latest version.

Probably, Enthusiast is all you need as it includes:

High-Res Constellation Illustrations
IAU Constellation Boundaries
5 Constellation Stick Figures

Thanks!