.img to .gho altiris7.5

We have recently upgraded our version of altris to version 7.5 from 6.1.   We have about 20 images that were created in the older version of Altris. (.img).  We would like to know how to either covert the images to .gho (or .ghs) or import them into the new build so we don't have to recreate all the images.  We have found online the resourceimporttool.exe but it does nothing when we run it.  Is there a place we can reinstall or redownload that portion?