Iroll:
With respect - I don't mean to be contradictory but there is no "Atmega328p (Old Bootloader)" option that shows as a Processor choice after Arduino Nano is chosen and the Nano is connected. I'm using Arduino version 1.8.5. Is it possible I need a different version?
Just because you have 1.8.5 means nothing.
Read reply #3 and this is the last time I am going to write this.