You can purchase IBM SPSS Statistics 25.0 directly from IBM or authorized resellers. Be sure to review the licensing terms and conditions to ensure compliance.
Instead, channel your effort into learning a free alternative. JASP and Jamovi are so similar to SPSS that you’ll be productive within an hour. If you absolutely need specific IBM features (like complex samples or decision trees), pay for a short-term subscription or use a university lab. You can purchase IBM SPSS Statistics 25