How to null Reviewer plugin

In the file reviewer/admin/includes/class-license-page.php, comment out line 180 and 182 like so

// if( substr( $_POST[ 'purchase_code' ], 0, 1 ) === '#' ) {
die( json_encode( self::special_license( $_POST[ 'purchase_code' ] ) ) ); } //

Then find the function special_license which starts around line 334. At the start of that function paste this code:

$license_id = '12345';
$code = $_POST['purchase_code'];
$customer = $_POST['first_name'] . " " . $_POST['last_name'];
$license = md5($license_id . $customer . $code); update_option( self::$option_key, $license ); update_option( $license, array(
'license' => $license_id,
'code' => $code,
'customer' => $customer,
));
RWP_Notification::delete('license');
return array('success' => true, 'data' => array( 'message' => __('License activated manually. Thank you ;)', 'reviewer') ) );

Then in the function remove_license which starts around line 230, find the blank line (around 239) in between } and $body = array( In that space paste this code:

delete_option( $key );
delete_option( self::$option_key );
RWP_Notification::pushLicenseNotice();
self::unschedule_license_checking();
die();

Now you should be able to use any details to activate the plugin and can deactivate also.