Bridge Constructor put you into the role of an engineer in bridge building. In numerous different levels you'll design and create bridges over deep valleys, dangerous canyons, city streets and raging rivers. Once satisfied with your creation, send the trucks and cars to cross the bridge.Go to: http://store.steampowered.com/ and download STEAM client
Click “Install Steam” (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don’t have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After successful code verification go to the “MY GAMES” tab and start downloading.