The very first thing you need to do is to download the files. You can find the link the email you've got from the order you placed.
Once the download is complete you will find a Zip file at the bottom of your browser
Now you will have to navigate to your project folder and create a new folder with the name "Plugins"
Now you can extra the content of the zip and move the corresponding plugin version to the Engine folder (ex: If you use UE 4.21 us the Plugin-4.21 file
All you need to do now is to launch your project as usually and the following dialog box will show up. Hit 'Yes' and your setup is complete.
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