How can I find Item Purchase Code for my WP child theme?

I have downloaded WP theme on Envato Element of unlimited plan. and created child theme. But I can’t update child theme and they ask me to white Item Purchase Code. But I can’t find it…
How can I find Item Purchase Code and update child theme?

Elements items don’t come with a p/code.

You can still use the item without having to ‘activate’ it - this is only for the purpose of auto updates etc. that are also not included with Elements downloads

Thank you for your comment. I will download theme again and import theme manually. then should I import child theme file or main file…?

Can’t use a child until a parent theme is installed

Just ignore any “register” or “validate” messages that may crop up in the WP admin

OK, I will try. Thank you very much for your advice.