Unzip the file, the content has 500 MiB. I know, weird, considering 6.2 MiB Zip file. Tech Info: https://www.memtest86.com/technical.htm On Linux you create USB bootable image as simple as: pv < memtest86-usb-v9.0-pro.img > /dev/sdX - Run this as root, of course; - X is your USB drive letter; - If you do not use pv, use dd, or whatever; - It may boot at this point, but I recommend running gdisk /dev/sdX and only w as for write; it fixes some backup header. Have fun! Seed as long as you possibly can, thanks