how do I install OScommerce without access to root folders?

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I am hosting with a company using Fantasico scritps to install an old version of OScommerce.  Is there a way to upgrade to 2.2-MS2 without having access to the root directories?

OScommerece is setup in the directory called SHOP

is there a way to update to the latest version by uploading the new files over-top the already setup cart?  Or is there something else that I can do?

I want to be able to add community updates to my store... but because it's an older version I can't do nothing without errors.

any suggestions on how to update using FTP access to my SHOP directory.