Hello

The Template App can be installed the same way as any other App from UNA Market.

You need to login into your Studio and go to Apps Market -> Purchases subpage. You should see the Light app there with the other paid Apps you've purchased. Then you need to click with 'Download' button. After that the App will appear in Downloaded subpage. You just need to click with 'Install' button there. That's all, the new template should be available in Studio and in User End -> Template Switcher in bottom menu.

P.S. If you don't see anything in Apps Market -> Purchases then you need to check 'UNA account key' and 'UNA account secret' settings in Studio -> Settings -> General section. They should be correctly associated with your domain name here: My Sites.

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Best Regards
AQB Soft