On Windows 10, tried the new 'stable' version 5.0.4 (543), and rapidly switched back to PsPad unicode 5.0.4 (539): In the new 'stable' version dark themes are missing (cannot find 'carbon' for example), other themes cannot be set - the only 'IDE-Style' is Windows, selected color shemes vanish on accept/saving ... maybe there's a plugin/extension needed for getting dark themes working like before.
-- <https://forum.pspad.com/read.php?4,74513,74513> PSPad freeware editor https://www.pspad.com
