I've downloaded Far Cry 3 through the steam account on my laptop, then copied the files to the Steam account on my desktop PC. I've put the game folder into the common files folder, just as I always do when I copy a game from another computer. This has always worked before. But this time, steam is acting as if the files weren't there, and is trying to download all 10 GB of it, again.
I'm reasonably sure I've put the Far Cry file into the correct directory (steamapps\common). When I tell steam to open local files, it opens the correct Far Cry folder, which has all 10 GB of the required data in it, and when I tell steam to check the files for errors, it tells me everything's fine. And yet it keeps downloading the game and right now is telling me it's got 300 MB downloaded and ten hours to go. What can I do to make it recognize the existing files?