The web is filled with malicious "ISO downloaders" and fake mirrors. Never download a Linux ISO from a generic "Softonic" or "CNET" style site. Always use official or university mirrors.
When you boot the ISO, the magic happens. Because the entire OS is so small, Puppy loads itself entirely into your computer’s RAM. This means that once booted, the system runs at the speed of your memory. You can remove the CD or USB stick, and the computer continues to run perfectly. puppy linux wary 5.5 iso