Plugin Microkid's Related Posts won't find posts when wp-config.php relocated

Hello,

The plug-in page, using version 3.0.1

Following a security tip, I relocated wp-config.php one level above in dir structure, so I have:

wordpress\
wp-config.php

When I try to search for related items I get an error

function.require
Warning: require(../../../wp-config.php) [function.require]: failed to open stream: No such file
or directory in <local path>\htdocs\wordpress\wp-content\plugins\microkids-related-posts\mrp-search.php on line 8

I tried to fix it by correcting require(‘../../../../wp-config.php’); in mrp-search.php, but then I get the following one

Warning: require_once(<local path>\htdocs/wp-settings.php) [function.require-once]:
failed to open stream: No such file or directory in <local path>\htdocs\wp-config.php on line 90

The line 90 is require_once(ABSPATH . 'wp-settings.php');

I see the wrong slash in path, but I’m not sure how to proceed, as I have no knowledge of PHP.
I’d appreciate any ideas on how to resolve this.