Theme settings does not work

My ThemeSettings does not work.
It opens, but nothing happens when I push on something or use search.
When I Push on Store (for example) it shows the list of elements in it, but I can’t open them or change anything.

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Hello,

Could you please disable all plugins that are not related to our theme and enable WP_DEBUG in the file wp-config.php so we can check it?

Thank you in advance

I can’t find this file. Where should it be?
And how should I enable WP_DEBUG? Physically what should I do?

The file is located in your website root folder. Find instruction in WordPress documentation https://codex.wordpress.org/WP_DEBUG

OK, I did it, what should I do next?

Now we see the error. You are running old 4.8 version of WordPress. You need to update it to the latest version.

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