Help with Kuroi stock by attrib mod

I tried running the sql script for Kuroi's Stock by Attributes mod but get the error below. If I was able to run the script and install the mod, would I see the new inventory option when setting up a new product?

Here's the error I receive when in Admin > Tools > Install SQL Patches:

1062 Duplicate entry 'STOCK_SHOW_LOW_IN_CART' for key 2
in:
[INSERT INTO configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, last_modified, date_added, use_function, set_function) VALUES ('Show available stock level in cart when less than order', 'STOCK_SHOW_LOW_IN_CART', 'false', 'When customer places more items in cart than are available, show the available amount on the shopping cart page:', '9', '6', NULL, now(), NULL, "zen_cfg_select_option(array('true', 'false')," );]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

"Duplicate entry " only means that this is already there should be safe to ignore this

So where would I set the quantity for an XL and L shirt of same style? I don't see it when creating a new product ... do you have a screenshot of what it should look like?

Thanks for the quick reply!

Alex

admin > catalog > products with attributes > select

Outlined in instructions with module