Instructions
Launch Impulse by double-clicking the icon on your desktop or selecting it from the Start menu.
Click the "My Games" tab, located at the top of the Impulse window.
Click "Sins of a Solar Empire: Entrenchment."
Click "Install" located at the bottom right corner of the Impulse window.
Select the language in which you wish to install "Entrenchment" from the drop-down menu.
Click "Install." Impulse automatically downloads and installs "Entrenchment" and the progress is available to view in the "My Games" tab next to the "Entrenchment" entry.