Downloading "Oracle VM Manager with Oracle Linux 188.8.131.52.0" will lead to two files with *.img. These files are no cd/dvd images. But you can find a solution here:
mount -t auto -o loop,offset=$((63*512)) System.img /mnt/System
But this leads to some files with oc4j containers.
So DO NOT search for "Oracle VM Manager". Use as search string only "VM Manager" and here we go:
(The installation can be found in this posting)