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In the field of computers, downgrade means reverting a program of a certain version to an older version of it, while up grading means the opposite.
A download is a transfer and saving of files from a remote system, such as a server, to a user, for instance: users can save files such as music files on their computer when they download them from a server (through websites). an upload means the opposite - a user transfers a file to a remote system, for instance: users of certain websites can upload photos from their computers into servers, and this way have their photos posted on websites.
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