Grub help

There is no ISO image and LE cannot run from an ISO image (so you can stop looking for one). If you want to install to spare space on an existing disk this can be done, but it's not a supported configuration so you won't find nice HOWTO guides and instructions for setting something up. Grub will work fine (we don't care what bootloader is used) if you configure the boot entry correctly; see contents of syslinux.cfg for ideas. LE requires two partitions; one for boot files (512MB) and one for persistant storage (8-16GB min) assuming media is stored somewhere else.