Knarly Mazes is a game of logic and deduction. The goal is to reveal the hidden maze. Each maze is guaranteed to have one and only one path between any two cells of the maze. This means that every cell can be reached from every other cell (there are no boxed-off areas). The puzzle tells you how many walls each cell has, and below and the right of the puzzle it tells you how many cross-walls there are in that row or column.
The Knarly Mazes tutorial will show you some of the many deductions you can make in this game.
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The demo and licensed versions are identical, except that the demo version has limited numbers of puzzles, and the licensed version may have additional support files (like extra image sets). So, if the demo version works for you, the licensed version will, too. If the demo version doesn't work for you, neither will the licensed version.
Generally, you don't need to un-install a demo version before installing the licensed version. The licensed version will install right over the top of the demo version and use all of the settings you've already created with the demo version.
NOTE: You can not upgrade your licensed version by installing a newer demo version over the top of the licensed version. You would just end up with a demo version.