AVRdude

Hi I would like to use avrdude to recover the hex file from one Arduino and copy it to another.

I cant get AVR dude to run. Some say its included within Arduino if it is I cant see it.
I've downloaded a version of AVR dude when I try to run it from the c:\prompt it says avrdude config file missing.
how do I install if required,
find it if I have it,
and get it to run.
any help appreciated

Ps I'm running windows 10 if that makes a difference