Extension Installation Guide
Backup your database and site
Make sure you have a complete backup of both your Magento database and your installation files. The changes are small that a problem during installation causes a big problem with your installation, but it is always good to have a backup available where your can rely on.
Disable Magento Compiler
If you are using Magento’s compilation mode on your store, it is important that you disable it. If an extension’s files are not in the system when this single file is ‘compiled’, they will not be included, this can cause a problem when loading your site. To check that this is disabled, go to System->Tools->Compilation. If the compiler status is ‘Disabled’, you are ready for the next step. If not, click the ‘Disable’ button on the right hand side of the screen.
Upload extension files
Unzip the downloaded extension package your have downloaded after you ordered. The extracted files are in the Magento directory structure, this means that you can upload the extracted files with your favorite FTP client to the root of your Magento installation.
Clear Magento cache
After all the files are uploaded to your server, navigate to System->Cache Managment. Select all available 'Cache Types', select the mass-action 'Refresh' and click 'Submit' to refresh all caches.
Login into Magento Backend
After your refreshed the cache, you need to logout and login again.