Here's a bit of info I found at BFG.
Adjust your Game Manager settings
If you continue to experience difficulties while downloading your game, such as slowness or a stalled installation, adjust your network connection settings.
1.Double-click the Game Manager icon to open Game Manager.
2.In the upper right corner of the Game Manager, click Options.
3.Select the Advanced tab at the top of the Options screen.
4.Confirm that the Default (recommended) option is selected before downloading your game.
If the download is not successful, select the Alternate Method and try again. We encourage you to try both of these options in order to determine which one is right for your network connection.
5.If you continue to have trouble, reinstall the Game Manager.