The installation story is straightforward but requires administrative control:
The Ultimate Guide to SPSS 27 for Mac: Installation, Compatibility, and Performance Optimization spss 27 mac
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If you own a perpetual license for SPSS 27, it is still a powerful tool. Do not upgrade unless you need Python 3.9 integration or official Sonoma support.
For those choosing between the two, here's a quick look at how they differ. The decision often comes down to the specific features you need and the macOS you are running.