Tried the Universal Installer method but after booting from the USB, I kept getting the message "Option 'maps' requires a sector". This was with Hiren's 15.2. I tried Universal Installer 184.108.40.206 and 220.127.116.11. I tried fast and slow FAT32 formatting. I tried two USB sticks. I tried booting a Dell desktop and a Lenovo laptop.
So I went back to the "official" approach referred to in oreo27's post: Hiren's BootCD From USB Flash Drive (Pen Drive) » www.hiren.info
I just used Windows to do the FAT32 format, then started from step 3. That uses grub4dos, which sounds ominous, but it's actually very easy following the instructions at Hiren's site.