Pyskool 0.5.3 has been released. The download page has freshly prepared copies waiting for you.
0.5.3 is a bugfix release. In earlier versions there is a bug that makes Pyskool crash when trying to load a game that was saved using
GraphicsMode 0 (hi-res colour); this bug is now fixed. Saved games from earlier versions in the 0.5.x series should work just fine in 0.5.3. Thanks to Alex for spotting the bug.