If the folder in the download doesn't provide enough info, I'll help:
1. Download the patch.
2. Open the folder.
3. Now in your "Cythera" folder, if there already isn't one, make a folder labled "Patches".
4. Put the "Pumpkin" patch in the "Patches" folder.
5. Drag the "Magpie" application in to your "Cythera" folder.
6. Start up the "Magpie" application.
7. Highlight the text, "Official addon: Magpie's Pumpkin Patch", some text about the patch should show up in the bottom right of the window.
8. Click "Make It So".
9. Your done! Just boot up Cythera and look for the changes!
The changes include:
All trees and some other greenery have been given a "Fall" tenting, and all items known as "Plants" have been replaced with Jack-o-Lanturns. This has no efect on the story or gameplay.
You might want to make a duplicate "Cythera Data" before applying the patch but the "Magpie" app has the option to remove the patch.
How about we make a new patch the does a massive overhall of the graphics of Cythera. That might inspire ASW to make the game a carbon version.
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