To download an MRI disk from a patient using the DICOM Open LiteBox program for Windows, you will typically need access to the DICOM images of the patient's MRI scan. These images are usually stored in a PACS (Picture Archiving and Communication System) server. You can connect to the PACS server using the provided DICOM Open LiteBox software and then download the specific DICOM images or series related to the patient's MRI exam. Consult the program's user manual or reach out to your clinic's IT department for more specific instructions on how to perform this task using the DICOM Open LiteBox program.