"You cannot use the application "Diablo III Setup" with this version of Mac os X"
Here is the working solution I found for a friend who needed to get around Blizzard's buggy installer for Diablo III on a Mac.
- Step 1: Download installer
- Step 2: Unzip to Applications
- Step 3: Run terminal and give permissions to the directory. Code should look like this chmod -R 777 /Applications/Diablo-III-8370-enUS-Installer-downloader.app
- Step 4: Open installer
- Step 5: Wait for the Butcher