Thanks for buying it. 

Installation:
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First, please unzip the downloaded xgift.zip file. The installation file name is  "xgift.ocmod.zip".  It is available inside respective directory for your opencart version.

1. Please Go to Extensions -> Extension Installer
2. Upload "xgift.ocmod.zip" and click on continue.
3. Now install from admin -> Extensions -> Filter by Order Modules -> X-Gift
4. Please navigate to admin -> Extensions -> Modifications, Now click the Refresh Button. 
5. Please navigate to dashboard -> Now click the `Cog` icon at the top right of the dashboard content. Now clear the theme cache by clicking the `Refresh` icon


Support:
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Please do support request by clicking on "Get Support" in the module page on the opencart.com marketplace.

Or you can send email to opencartmart@gmail.com for quick response.