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A book with lots of photos and diagrams.

Software or, potentially, a virus.

He clicked "Download." Once the file landed in his folder, he didn't open it immediately. He checked the . It was .pdf . If it had been .exe or .scr , he would have deleted it instantly, as there’s no reason for a "guide" to be an executable program. download/view now ( 46.47 MB )

Once downloaded, ensure it’s a document (.pdf, .zip) and not a program (.exe, .msi) unless you are specifically looking for software. A book with lots of photos and diagrams

Instead of clicking blindly, Leo hovered his mouse over the link. At the bottom of his browser, the URL appeared. It didn't lead to a random, gibberish website; it pointed to a reputable file-hosting service. he would have deleted it instantly