The 8th edition of Using SPSS for Windows and Macintosh is still under active copyright by Pearson. While the 8th edition is not the latest edition (newer versions exist), it is still sold commercially.
Websites claiming to offer a "free PDF" of this book usually fall into two categories: using spss for windows and macintosh 8th edition pdf free
Here is a secret professors don't always tell you: The menus in SPSS for Windows/Mac look 95% the same between versions 23 and 29. The 7th or even 6th edition of Green & Salkind costs as little as $5–$10 used on AbeBooks or eBay. The chapter order might shift, but the instructions for running a t-test are identical. The 8th edition of Using SPSS for Windows
Using SPSS for Windows and Macintosh: Analyzing and Understanding Data (8th Edition) The 7th or even 6th edition of Green
When searching for it is vital to understand the digital landscape you are entering.