This is a navigation bug in the Bootable Rescue Media. If your mouse is disabled, you can't get past a certain point in the Image Creation. When creating an image, it asks you if you want to add a Comment to the image file. There doesn't seem to be a way to get past this screen without a mouse. Pressing Tab merely moves the cursor, as does pressing Enter. It doesn't let you get to the Next button to go on to the final step.