• If compilation mode in your Magento is enabled in your Magento store, you have to turn it off, otherwise your store and admin site would be inaccessible after installing the extension.
• To disable Magento Compilation, go to System–>Tools–>Compilation.

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• Make sure you have backed up your Magento files and databases in case things go wrong.

• You have to turn on your configuration cache to prevent early installation, as it could be a reason of errors.
• Go to System→Cache Management.

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• After purchasing and download the module's zip file, unzip it into a directory of your choice.
• We recommend using FileZilla to perform the installation via FTP. Enter your store's Host IP, Username and Password, then hit Quickconnect

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• Carefully upload the files of the module to the corresponding directory

• You should refresh Magento's cache to provide Magento with the ability to register a new extension.
• To prevent an “Access Denied” error, you have to re-enter to the backend. Log in with a full administrator account to get the new permissions.
• Now you should check whether your website and your new module works as expected.