ctrl+Z?
It's not in the recycle bin obviously, is it lost forever? :(
Maybe you can download some data recovery program if such a thing exists
the problem is downloading the program over what you deleted, which i did to an extremely important homework project once.
download onto a usb stick or sd card and run from there?you could change the browser settings to download directly onto the usb stick or sd card or whatever
Now you know why you use version control when working on large projects...