About This File
Original file: https://archive.org/details/Half-lifeOpposingForceDemo
This is the official demo for Half-Life: Opposing Force. It includes 3 partial chapters (and a training level) from the full release.
Note that the demo uses an older version of GoldSrc and may have compatibility issues with modern systems. Also, this is the full version of the demo and does not require Half-Life to be installed.