generally, yes that will work fine as long as the usb stick drive is formatted on the pc side first. the mac can handle the pc format, but not the other way around.
however. impulse is used as the downloader app which is NOT mac compatible. so, if the friend is running Windows on his Mac, then there is no issue at all. they install impulse, login, and download and archive SINS. move the archvie to a usb stick and then on to your computer.