I forgot to mention it requires you to rename the dicom containing folder to "DICOM" or it won't work. I was able to copy paste both DICOM images of CT and MRI in same "DICOM" folder and that worked. Once the electrodes are created, it creates a folder called "registered" in the patient's imaging folder. I looked and the folder size is 6GB so I think there is some waste of file space to copy the images. I see the image files are .nii format and are the reason the folder has a large file size.