EcoStep

1. Click "Download"
2. Extract all files from zip file
3. WINDOWS: find exe file named "assignment"
    MAC: 
        a. Go to System Settings → Privacy & Security.
         b. Scroll down to the Security section.
         c. There should be a message like “assi_mac.app was blocked from use because it is not from an identified developer” with a button Open Anyway.
          d. Click Open Anyway, then confirm in the next dialog.