If you occasionally use Linux (or macOS) you probably use Gimp as a PSP alternative, and if so, then chances are you miss PSP badly
They come with a detailed Readme.txt file, and on-line reference.
I keep them on my DeviantArt, but I think DA allows d/l only to its members. Maybe it lets everyone to D/L (I'm not sure) and creating an account is free, but to save people any hassle I have also put the bindings on gnome-look (which sometimes gets offline, so I have also put them temporarily on MediaFire too).
Have fun
