August 10, 2012, 6:47 PM — Here's how you can install purchased Windows 8 apps onto another computer.
1. Open the Charms bar.
2. Click on Settings.
3. Click on Your Account.
4. Right click any place on the screen.
5. Click on Your Apps in the App Store bar at the top.
6. You'll see a list of purchased apps.
7. Click on the app you want to install, then click on the Install button.
For more, see the original article at the link below.
Install Purchased Apps from Windows Store on Another PC | Help Desk Geek