IF you have recently upgraded to macOS Sonoma, you will find that SPSS will no longer work, as macOS Sonoma is not one of SPSS’ supported platforms and is incompatible with most versions of IBM SPSS Statistics. https://www.ibm.com/support/pages/node/7041357
There is however a manual fix that not all users have successfully applied to SPSS Sonoma users.
How to apply the hot fix:
1) Download the libplatdeb.dylib file linked on this page.
2) Close all instances of SPSS.
3) Navigate to "/Applications/IBM SPSS Statistics/SPSS Statistics.app/Contents/lib/". You can do this by opening your Applications folder, opening the IBM SPSS Statistics folder, right-clicking on SPSS Statistics, clicking "Show Package Contents", opening the Contents folder, then opening the lib folder.
4) Copy the libplatdeb.dylib file you downloaded in step 1 to this folder, replacing the existing file, when prompted.
5) Make sure the installed files have correct permissions (e.g. chmod 755)
6. IBM SPSS Statistics 29 is now ready to be used.