Loop mount the iso
From MEPIS Documentation Wiki
It is possible to mount an ISO file as it were a CD by using a loop device.
su mount -o loop SimplyMEPIS-CD_6.9.85beta4_32.iso /mnt/temp
In this case SimplyMEPIS-CD_6.9.85beta4_32.iso is mounted to the temporary folder /mnt/temp to unmount run:
su umount /mnt/temp
If /mnt/temp directory doesn't exist, you need to create it before running the mount command: