IBM offers a fully functional of SPSS Statistics (including version 27.0.1 or newer). This is the only official, legal, direct-from-IBM free option for individuals.
If you only need the software for a short-term project, the official trial is your best bet. ibm spss statistics 2701 free
If the trial expires and you cannot afford a license, these free programs offer similar functionality: How to Download SPSS for Free | Step by Step Guide IBM offers a fully functional of SPSS Statistics