I started downloading a game. It reached 9GB out of 12GB total. I paused the download and shutdown my computer to go outside, but when I logged back in again in Steam, the game's download reset to 0GB complete. How can I continue the 9GB finished download?
I've seen this issue come up pretty frequently lately. But the good news is there is a work around.
You'll need to check for the "Local Content" of the game in your Steam Library folder. If these files are here and are relatively the same size as your downloaded portion (9 GB) you should be able to recover them by moving the files from your steam downloading folder to your steam common folder and restarting steam. This will force steam to try to install the game, realize the game isn't finishing downloading, and fetch the remaining pieces.