Proceed the following steps to install EasyBanners extension at your store:
- Navigate to System > Tools > Compilation and disable compilation mode.
 - Go to your magento store root directory via FTP or CPanel.
 - Create file 
maintenance.flagin root directory. - Open your store in browser; you have to see page
Service Temporarily Unavailable(if you don’t see this page - probably you are trying to install extension at wrong magento instance). - Unpack all files from extension archive into your magento store root directory.
 - Remove file 
maintenance.flagwhen copy process completed. - Login your store admin and add the banners.