1. Turn off your internet connection and Install SPSS 20 for mac.
2. When License Authorization Wizard pops up, press Next button, and select "License my product now", press next.
3. Enter the code, 285DD4CD2854F4E67605, press Next, and then Next.
4. Select "Desktop e-mail" and then click on the button "Enter License Codes"
5. Copy and paste the license codes 4B6MINO86Z4LZV9AA7GHEC89P5TRNTOHAA3XKX5YW7GM2SWHCCTAFYBL3B3IKPMM7I9N3MSTBXOO8VPKXZHSEXGST8