Ok, a followup with further troubleshooting steps. Looks like there are two separate issues: the download and the save file problem. The one I really care about is the save file issue, and after a little more testing, it looks like that issue only happens on the Community Patch version of the game. ...

Hey folks, just bought the game on Steam, I'm super excited. In trying to download and install the game, I ran into a disk write error several times. I've downloaded other games from my library just to make sure they worked, and they all installed and ran fine. I managed to successfully install the ...