Live usb maker comes preinstalled on antiX and MX. For other linux distributions an AppImage is available for download from here; However this currently is for 64 bit only. Once you have downloaded the package you must open your downloads folder, extract the package, and run the AppImage with root priveleges (to read/write/format/mount the usb). deb packages are also available for download through the antiX repos or the source code on gitlab. The helpfile or instructions for using live usb maker can be found here