

This solution should work if the game is displaying in the library folder in Steam with the words 'update required' written next to it but the game won't recognize the existing game files on the hard drive. If I copy it to steamapps\downloading\200260 then the download keeps stopping every few seconds with "Disk Write Error" after modifying 1 or 2 files, and I have to keep hitting resume. Assuming I have the correct folder name steamapps\common\Batman Arkham City GOTY, according to this, if I copy the files there, Steam seems to just continue with its 17GB download.


Now I tried both of the above things, in either case, the validating does not seem to do anything. More specifically, I had a retail copy of Arkham City installed and I just bought the GOTY version on Steam. So what would be the correct way of doing the same thing, that is, make steam use as much of the existing files as possible? Should the files be copied to downloading\*\, or should I figure out the actual folder (say via googling) and copy the files to steamapps\common\*\? So first of all, what the final folder would be is not clear. Since this folder would be created on starting the download, pausing and closing steam, copying the game files to this folder and then validating game files would make Steam absorb as much as possible and just download the missing files.Ĭurrently, Steam downloads the files to steam\steamapps\downloading\ and then moves them over to the aforementioned folder once the download finishes. Previously, as far as I understood, Steam downloaded the game files directly to steam\steamapps\common\. This is very useful as it saves both bandwidth and time. It should be possible to use the existing installation to avoid the generally big downloads. I buy the same game (or a minor variant of it, say the GOTY edition) on Steam. Let's say I have a game bought on retail/other digital download and installed on my hard drive.
