There are two ways of installation of this extension.
1. First way is to extract zip folder and copy app folder , media folder , skin folder and paste all these folders on your magento root directory
2. Second way is to install it from admin pannel, follow below steps:
Go to admin panel - System -> Configuration -> Magento Connect -> Magento Connect Manager and uncheck " Put store on the maintenance mode while installing/upgrading/backup creation" option and browse file and upload it.
Now clear cache for that you would do the following:
Go to admin panel - System -> Cache Managment, select all and click on submit button.
Now follow documentation for proper use. This is payment gateway extension for Etisalat payment gateway.
Magento Etisalat payment redirect gateway extension.