Free Theme, It ask a purchase code for activate?

I download a free theme for your promotion period, and I install its , and this theme ask a purchase code for activate, What is a purchase code???

I see a pdf file, it say that a item purchase code is : FREE, I use a “FREE” for activate, It can not

Thank you very regards

Pairoj T.

The theme will work without “activating” it.

Activation is only for premium features (as per screenshot) such as auto updates and support which are not included with free items.