Can't play warcraft III classic

i already pre purchased wIII: reforged, i downloded the app and warcraft III is already installed, but when i open the game, it ask me for the cd-key and i don’t where i can find it or how i can start de game. need help! i have a macbook pro with macos catalina

Hey, JSRomero! The problem you’re running into is apart of a known issue. Our team can assist with a workaround, please contact our Customer Support team.