IBM restricts Faculty Pack licenses to 2 activations to be used on 2 separate machines (1 activation per machine) provided you are the only user of the license on both machines. Once activated your license cannot be deactivated, suspended, paused or transferred to another machine. De-activations and transferability are features limited to more expensive Commercial licenses which are $1000's per annum.
Upon installation, SPSS extracts your machine's "lock-code" (a unique identifier for your machine) which it uses to activate your license. In the event of computer hardware changes (e.g. reformatting or replacing your hard drive) or updates to your operating system (i.e. updating Mac OSX), a new lock-code may be created by your machine. For your SPSS license to work with your new lock-code an additional activation is required.
If one of your activations remains unused, you can use it to license SPSS on your machine. Otherwise, you will need to purchase a new license.
To activate SPSS you will need to open the License Authorization Wizard following the instructions below:
Mac users
Windows users