If you are a registered user, you can get it here:
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Just install it over the previous version and your save game data will carry over.

Recent Changes:

v2.022
Game can now be continued from the Play menu, including from checkpoints.
Title now sparkles in.
Fixed bug: could lose globes when restarting from checkpoint.
Fixed bug: invisible green slime drops in level 11.
Fixed bug: falling treasure sometimes behaving like keys.
Repositioned level 10 inn for easy access.

v2.03
Added highscore table at end of game.
Fancy-pants title screen.
Improved some background graphics.
Defaults to 8-bit colour for slower PCs.

The continue game feature might need a bit of explanation..

If you choose 'Play' from the main menu, you can now opt to start from the last progress point you reached, instead of starting from level 1. This could be the start of a level, a section, or at an inn. Basically it just means you don't need to leave your computer on with Jasper running to avoid losing progress (:

Edit: if you've just upgraded, the continue option won't be there the first time you run it, because it won't have had the chance to save anything yet!