http://www.zen-cart.com/index.php?ma...oducts_id=1922

Do not use 1.0.1. That was modified for a specific site and most likely will not work on your site. The author has uploaded 1.0.2 which is pretty much the same as 1.0.0.

One thing I have noticed. If you do a search for a part (i.e. you have part number 3001, 43001, 3001-45, etc. and do a search for part number 3001) and it pulls up all these parts. You will see
"compare_default" under the tick box.

copy the defines from the supplied index.php file to your advanced search result.php file and upload it to your template folder.

note one thing i have noticed is that in the advanced search results screen, you cannot compare products. I have notified the author of this.