Recently my steam game updates would halt on the install part. I tried to verify local game cache like most people suggested but to no avail. I check the directory user rights but all those where correct too.
Then I found the following fix that worked for me.
Exit steam by going to the main tool bar click Steam >> Exit. You will be presented with the following dialogue.
Press Exit now.
Start the windows task manager by right-clicking on the windows bar and select Task Manager.
Find the Steam Client Bootstrapper entry and right-click >> end task. If you can’t find it, Steam got shutdown gracefully and you can proceed.
Navigate to your steam apps directory and locate all *.acf files.
Find the corect one that corresponds to your game you are trying to fix and change the extention. Ex: *.acf to *.acf.old.
Start your Steam client. The game should now be “grayed out”.
Press Install game….
After steam verifies your local files and/or downloads missing content. The game should be ready to play.