An error occurred while updating steam fish dating sign in
While installing or updating a game like Dota 2, Fallout 4, Grand Theft Auto V and Player Unknown's Battlegrounds, Steam sometimes displays an error message which reads "An error occurred while installing/updating [game title] (disk write error)". Commonly known as Steam disk write error, this issue can occur anytime when a game is updated or installed on Steam, leading to Steam unable to complete the installation.
And disk write error shown in the parenthesis is the specific reason responsible for the error. If you are having troubles updating a game or installing a game on Steam due to a disk write error now, try the following solutions out. This solution is provided by a Reddit user and many users rate it useful.
Go to the file location of Steam (default location is C:/program files/Steam). Head to the Compatibility tab in properties and make sure "run this program as an administrator" is ticked. In short, he just solved this issue by going into Program Files (x86)/Steam/steamapps/common and simply deleting a file titled Fallout that was 0KB in size.
When he re-launches the game, Fallout 4 loads up perfectly.
If it's not caused by anti-virus software, the issue could be a corrupted file or failed download.