Wordpress Newspaper 8.1 theme - Activation method

First of all go this path /includes/wp_booster/td_cake.php.
Open td_cake.php file in any PHP editor.
Find

function td_cake_manual($s_id, $e_id, $t_id)
and change below code

if (md5($s_id . $e_id) == $t_id) {
return true;
} else {
return false;
}

with

if (md5($s_id . $e_id) == $t_id) {
return true;
} else {
return true;
}

Then open includes/wp_booster/td_ajax.php
on line 891 replace: return false; with return true;

Then go to theme panel go to Activate theme, click Activate the theme manually (at the bottom (footer)) use any code and key without any error.