Aperture Ireland tells the story of a test subject in one of Aperture's regional branches. Solve puzzles and dodge bullets as you start to unravel the facility's dark secret.
This is the full download for version 1.1 - please use this and not the original below. This is a 7-zip archive, which needs 7-zip to extract, and installation instructions can be found in a README file inside (for now). See description below for system requirements, etc.
Mirror (if you can't download it): Vigovproductions.net
You need 7-zip to open the archive. Extract the aperture_ireland folder into your sourcemods folder (consult the README if you're not sure about this), then download (save, don't open) this SteamPipe patch (if you've upgraded Portal 1 to SteamPipe) and place it in there. After that, follow the README instructions.