Because it was built for older hardware, version 4 has very low requirements by today's standards:
If you have an old license or a physical CD, here is what version 4 offered:
: Built for Mac OS X 10.4 or 10.5 (Leopard). It will not run on modern macOS versions that require 64-bit applications.
: Designed for Windows XP or Vista. It may run on Windows 10/11 in Compatibility Mode , but stable performance is not guaranteed.
: Introduced two distinct workspaces: "Drawing & Painting" and "Photo Painting".
: Assisted in photo-painting by following the contours of an image for more natural strokes.
Officially, there is no "free full version" of Corel Painter Essentials 4. Corel typically offers a of its current version rather than older legacy versions.