It's OK Jason. I figured it out.
Webassist/plugins/side_menu/sidemenu.php
Line 25 needed to be changed from:
From: $linkTo = 'products_results.php?Search=1&ProductCategoryID[]='.$row_SubCategoryList["CategoryID"];
To:
$linkTo = '../../../products_results.php?Search=1&ProductCategoryID[]='.$row_SubCategoryList["CategoryID"];