Make Bootable Hiren's USB in easy steps.
"Hiren's CD to Bootable USB" is a free to use tool to make bootable USB disk from Hiren's CD iso.
https://knowit-now.com/download-hirens-boot-cd-15-2-iso/
https://knowit-now.com/download-hirens-boot-cd-11-0-iso/
https://knowit-now.com/hirens-cd-2-bootable-usb/
You can get support on Facebook page https://www.facebook.com/Hirens-CD-2-Bootable-USB-1440129386302328/