Actually the installation procedure is wrong. It tells you to modify catalog.php, but it only adds a string to a label in the admin panel, not a real link to EP.
My fix:
You go to catalog/admin/includes/filenames.php
Around line 26, you add this:
// Patch for easy populate
define('FILENAME_EASY_POPULATE', 'easypopulate.php');
// End patch for easy populate
then in catalog/admin/includes/boxes, you add
'<a href="' . tep_href_link(FILENAME_PRODUCTS_ATTRIBUTES, '', 'NONSSL') . '" class="menuBoxContentLink">' . BOX_CATALOG_CATEGORIES_PRODUCTS_ATTRIBUTES . '</a><br>' .
I put that line right after:
'<a href="' . tep_href_link(FILENAME_CATEGORIES, '', 'NONSSL') . '" class="menuBoxContentLink">' . BOX_CATALOG_CATEGORIES_PRODUCTS . '</a><br>' .
It should fix it.
Kiskit