A hardcover copy of Bulletproof Problem Solving costs approximately $25-$35. For many students and young professionals in emerging markets, that is a week’s worth of food. Searching for a free PDF on PDFDrive is an economic necessity, not a moral failing.
The PDF on PDFDrive is the map. But you have to walk the terrain. Don't just collect the file. Use the seven steps tomorrow morning on a real problem. Define the issue. Disaggregate it. Build a hypothesis. Synthesize the story.