Sorry so late. For some reason, I didn't get a reply notification...
I turned on debugging before, but didn't scroll all the way to the bottom to see the actual results.
Anyhow, I'm running 9.2.9, I deactivate the module, upload the new files, then go to the "Upgrade" link from the "edit" link for the module, and here is what is produced...
includes/db/db.php
* CMS Warning line 75: On /admin.php?op=modules&upgrade=16 While executing query "ALTER TABLE cms_cart_cartitems ADD itemWeight DOUBLE(10,4) NOT NULL DEFAULT '0.0000'" the following error occured: Duplicate column name 'itemWeight' In: /home/smithsgr/public_html/modules/Storez/cpg_inst.php on line: 1057