I love this game and i purchased the Reforged. BNut i love too the old versions and that read we will get the old versions freely. But sadly nowhere found these date. If somebody know pls tell me.
Thy very much 
Click on the GAMES tab at the top of the screen, click More Games bottom left of the drop down, scroll down the page it takes you to and click on Warcraft III to go to it’s main page. Under the BUY NOW button there is a Download Now link, scroll down the Download page it takes you to and you should find Warcraft III in the Classic Games section. Download the installer, run it, and once it has finished launch the game. It will pop up a window where you can chose to log in to your BattleNet account to verify the game. Then you should be good to go.