I am just getting started in this also, and after you install the store it places the webassist folder in the main area where your site is. So basically, if you are looking at the local files, there is almost no way you will find this. But it is install/webassist/.
Once you install the store, it takes that folder and puts it on its own, so what I did was "get" the folder from the remote site back to my local location.