This post shows how you can change the theme on your Magento website using Magento Connect.

After you have log in to Magento admin, goto System/MagentoConnect/MagentoConnectManager

  1. Look for “Install New Extensions”
  2. Search for modules via Magento Connect.
  3. Search for your theme and get the extension key.
  4. For a free theme, your extension key looks typically like this – http://connect20.magentocommerce.com/community/theme_name.
  5. Copy the code.
  6. Return to your Magento Connect Manager.
  7. Paste the extension key to install and then click install.
  8. Now return to Admin.
  9. Go to System/Design/
  10. Add or edit design change. Select the theme and your theme throughout the website is set.