I have always just left the downloads folder alone. Never recalled going back and using it much if at all. What is recommended to do with all the contents. Most programs have likely been upgraded and I doubt if I would need to keep what is in there. I have gone back to a previous version of something now and then. Not very big on this computer but I wondered if all the files in there need to be kept and how to tell which. In transferring, I believe this was one source of many files which had too long file names to be transferred. They are not all that big ..maybe 500-1000 MB in size. Maybe just go through and see what is there and delete what I do not want? What do other people do?