Make sure your battery is fully charged before starting a download.
Select > .
In the app details view, select .
If the item has a price, select buy. If the item is free, select install.
If you're not signed in to Windows Live, sign in now.
By default, purchases are added to your phone bill, if available. You can also pay with your credit card.
Follow the instructions shown on the phone.
When the download is complete, you can open or view the item, or carry on browsing. Downloaded music, videos, and podcasts can be found in the Music+Videos hub, games can be found in the Games hub, and apps can be found in the apps menu.
For more info on an item, contact the publisher of the item.