Perhaps they referenced this guide to create a bootable Live USB on Windows, allowing them to test drive something like Ubuntu without making any changes to their PC.

How to make a bootable USB drive If you're trying to install a new operating system or flash your BIOS, you're going to need a bootable USB drive - here's how to make one.

By following these steps, you can easily create a bootable Ubuntu USB from a Windows system, enabling you to test Ubuntu or use it for troubleshooting and data recovery.

Most IT professionals carry a bootable USB with recovery software, Antivirus scanners, Bootable Linux, etc. But the problem is that they need multiple USB drives for each image.

Thanks to open-source gem UNetbootin, you can quickly and easily transform a flash drive into the ultimate rescue tool.

Make sure that your computer's BIOS is set to boot from USB devices then insert the USB flash drive into a USB 2.0 port. Turn your computer on and watch it boot to the installer boot menu.