You can often find the original demo versions of the game for free on archive sites. These include a limited number of unique missions not found in the main game.
The GOG version includes the original Tides of Darkness campaign and the Beyond the Dark Portal expansion. Warcraft II Battle.net Edition Free Download
Older versions of the game (from the 90s) rarely run on modern Windows without a DOS emulator like DOSBox or specific community patches. Key Game Features If you are looking for info on why this edition is special: You can often find the original demo versions
Finding a free download for Warcraft II: Battle.net Edition is a bit tricky because the game is still under copyright and is officially sold as a commercial product. While you might find "abandonware" sites offering it for free, these are generally not authorized by Blizzard Entertainment. Older versions of the game (from the 90s)
This 1999 edition brought the 1995 game into the modern era (at the time), allowing players to find matches easily online.
It added features like "Hotkeys" and better unit grouping that weren't as refined in the original 1995 release.