How to obtain Visual Studio 2012 Update 3
Download Visual Studio 2012 Update 3 package now
Updates for other products in the Visual Studio family can be found on the Microsoft download site for Visual Studio.
Note Visual Studio and Team Foundation Server (TFS) installation mechanics are different. The Visual Studio update installs on top of whatever is already installed on the computer. The TFS update is a full layout that replaces whatever is installed on the computer. Before you try to apply the TFS update, make sure that you have a full backup of your current databases. If the TFS update installation fails, you will be unable to restart the update or roll back to the earlier version of TFS without performing a restore procedure.
For installation guidance for Visual Studio products, see:
How to install Visual Studio
How to install Team Foundation Server and Visual Studio ALM