First you need to check the file of home page is available in your theme template folder or not. It means your path should be like this.
After installing the new theme, you have to set that theme for the magento.
To set that theme you may follow the following steps.
1. Open Admin panel
2. System Menu -> Design Option.
3. âAdd Design Changesâ option at top-right corner.
4. Select the theme (your theme name display here) from âCustom Designâ option and Press the Save.
Hope this will help you.