FF Auto downloaded

Hello, I am using FF portable 2.0.0.12.
I was cruising the web and just as I finished it said that updates,
were downloaded, I didn't want to let it install, so I told it no or later, I clicked an X if it was available I can't remember that.
BUT, after that it said it would install the next time FF was
started.
How can I delete the file/S that were downloaded so i can do it
myself ?...before I start FF.

I also checked my settings before I shut down, and it was not
suppose to download, it was only suppse to "ask me" what to do.

I don't and never have had a "Local" copy of FF.
Only my USB.