If you own the game or have a subscription, the installation process is handled through the Battle.net Desktop App.
Download and install the Battle.net App. Warcraft III Free Download
The short answer is of the full game released by Blizzard Entertainment. However, there are specific legal ways to access the game if you have previously owned it or if you use specific subscription services. If you own the game or have a
Log in to your Battle.net Account Overview and enter your legacy CD key in the "Redeem a Code" box. Warcraft III Free Download