If I upgrade to the Director's Cut of Deus Ex Human Revolution on Steam, which is where I also have my prior edition of the same game, will the game download and overlay over the old game and keep my saved game files as is? Or do I have to start all over again?
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To be clear: you are asking how your settings and save games from the base game interact with the Director's Cut version? – two bugs Mar 22 '16 at 17:00
The games are treated as separate SKUs, applications, and downloads, and the save files are incompatible. You will have to start over for the Director's Cut.