How to boot old WC3 on Mac

Hello, I am running a late 2009 27’ IMac and I use to play WC3 on it all the time. Suffice to say the new reforged doesn’t work on it, but I heard you can play the old WC3 along side Reforged players. However, the game forced me to download a 30 gigabyte update and now it crashes on launch. How do I boot good old WC3 and not reforged? Each time I click the app, it opens my battle net. I see no option to select classic WC3 on there.


That’s nice!, but is it possible to LAN with people playing WC3R using this test realm? I was lead to believe that people who had the old version could play with people who had the new version.