The new shadow system threw me at first, but I think I've figured out how to get the same effects I was getting with 4.1 and previous versions.
00:00 Intro
00:33 Original setup
01:03 Blender 4.2 setup
01:26 4.2 Shadow Quality
02:12 Soft Shadows
03:17 Material Settings
03:35 Render shadow only
03:57 Render object only
04:37 Fixing older files