So, I am trying to free up some space on my Macbook. I have downloaded a cleaner app to get rid of temporary files, browser caches, and all that junk, I've moved all my desktop, document, and download files to an external hard drive, and I have emptied my trash can. However, after all of this, my Mac still says I have 139GB in "Other" files. What could these files possibly be and how do I get rid of them? Need help ASAP please!