You can buy a subscription or perpetual license directly from the IBM SPSS Statistics Portal Institutional Access:
Installation/Activation of SPSS 29 for Windows - servicedesk.msstate.edu ibm spss statistics 29 license key
Search for "IBM SPSS Statistics License Authorization Wizard" in your applications. Select License Type: Authorized User License (typically for individual purchases). Enter Code: You can buy a subscription or perpetual license