You can "borrow" a digital copy for a limited time through the Internet Archive's Open Library.

Thinking, Fast and Slow by Daniel Kahneman is a copyrighted work, which means official "free" downloads are typically limited to rather than open-access PDF sites. You can access it for free through the following legitimate channels: Legal Ways to Access for Free

Some library systems provide instant access to the ebook via Hoopla Digital .

Similar to Libby, many local institutions like the San Jose Public Library use CloudLibrary for digital lending. Why You Should Be Careful Thinking, Fast and Slow