Unfortunately I haven't written an admin mod yet. An admin mod is anything that modifies the admin-side of your zencart. This includes; adding new products, receiving new products... Unfortunately UPC mods work on the admin side when you enter items. And yes you can easily turn this into UPC1, UPC2, SKU, or whatever else you need. Also my mod doesn't ''automatically'' do anything except for the database, because the rest must be done manually following my README.txt file. I realize that the way of doing it by hand is rather tedious and annoying, but that's the only way to do it as of yet. Your only possible solution for simple installs is to follow the instructions in README.txt and put that PHP file in your website and check if you have a ''clean'' install. If that's the case then great, just follow my instructions on using patch.bat or .sh and you should have my mod working. Reason why you can't or shouldn't just do that without checking is, if you have other mods in place my mod will delete them making your file identical to my own. Mind you this is NOT what I nor you want, unfortunately this is the only way available for patching as of now. Also on a side note, the next version of Zencart should come with UPC and mabye SKU as well, but that's just what is expected. If you have any more questions about instructions I provide in my README.txt ill be more than happy to help!

--Alex