This patch is for the single-player Far Cry level, adding the Research level. Be sure to follow the installation instructions.
To install:
Back up your original \\Far Cry Demo\\Scripts\\MenuScreens\\Campaign.lua file. Then replace the file with the Campaign.lua from this .zip file.
Extract the included research.zip into your \\Far Cry Demo\\ directory. Make sure you extract using the folder tree of the zip file, so new files get created in FCData\\ and Levels\\