First download the addon zip file from the license dashboard.
After that navigate to Add-ons in your Xenforo Dashboard, and upload it by clicking on “Install/upgrade from archive”.
You may want to set your forum in maintenance mode before installing / updating the addon.
Please make sure to check the “overwrite files” checkbox.
After installing the addon, you will find a new section on the Xenforo dashboard called “Native Client App”, where you can setup and customize your app.
If you have questions about this or other topics, feel free to contact us and ask!