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before opencart 2.2 version


if (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/product/category_' . $category_id . '.tpl')) {
    $this->template = $this->config->get('config_template') . '/template/product/category_' . $category_id . '.tpl';
} elseif (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/product/category.tpl')) {
    $this->template = $this->config->get('config_template') . '/template/product/category.tpl';
} else {
    $this->template = 'default/template/product/category.tpl';
}

opencart 2.2 version onwards


Since Opencart changed its method from 2.2 that code doesn't work anymore, you can modify it like this:
First we must know which theme is active, store its name in a variable
$config_theme = $this->config->get('config_theme') == 'theme_default' ? 'default' : $this->config->get('config_theme');
Then we must check if there is a file specially for current category, for example if we are on category 20, we check for category_20.tpl existance.
if (file_exists(DIR_TEMPLATE . $config_theme . '/template/product/category_' . $category_id . '.tpl')) {
If found that file:
$view = 'product/category_' . $category_id;
if there is no such file, use original file: category.tpl
} else {
    $view = 'product/category';
}
load selected view file based on above statement.

Since Opencart changed its method from 2.2 that code doesn't work anymore, you can modify it like this:
First we must know which theme is active, store its name in a variable
$config_theme = $this->config->get('config_theme') == 'theme_default' ? 'default' : $this->config->get('config_theme');
Then we must check if there is a file specially for current category, for example if we are on category 20, we check for category_20.tpl existance.
if (file_exists(DIR_TEMPLATE . $config_theme . '/template/product/category_' . $category_id . '.tpl')) {
If found that file:
$view = 'product/category_' . $category_id;
if there is no such file, use original file: category.tpl
} else {
    $view = 'product/category';
}
load selected view file based on above statement.
$this->response->setOutput($this->load->view($view, $data));
conclusion:
find $this->response->setOutput($this->load->view('product/category', $data)); in catalog/controller/product/category.php and replace it with above codes, here is full code:
$config_theme = $this->config->get('config_theme') == 'theme_default' ? 'default' : $this->config->get('config_theme');
if (file_exists(DIR_TEMPLATE . $config_theme . '/template/product/category_' . $category_id . '.tpl')) {
    $view = 'product/category_' . $category_id;
} else {
    $view = 'product/category';
}
$this->response->setOutput($this->load->view($view, $data));




ONE MORE TYPE EXPLAINATION OF  OPENCART 2.2

 
//$data['header'] = $this->load->controller('common/header');

if (file_exists(DIR_TEMPLATE . $this->config->get('config_template') . '/template/product/category.tpl')) {
if ($category_id == 67) {
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category_67.tpl', $data));}
elseif ($category_id == 69) {
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category_69.tpl', $data));}
elseif ($category_id == 70) {
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category_70.tpl', $data));}
elseif ($category_id == 71) {
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category_71.tpl', $data));}
else{
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category.tpl', $data));}
/*if ($category_id == 69) {
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category_69.tpl', $data));}
else{
$this->response->setOutput($this->load->view($this->config->get('config_template') . '/template/product/category.tpl', $data));}*/
}
else {
$this->response->setOutput($this->load->view('default/template/product/category.tpl', $data));
}

} else {
$url = '';

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