cd #this should take you to your home folder
wget http://gnaag.k2city.eu/nautilus-breadcrumbs-hack.tar.gz
tar -xvf nautilus-breadcrumbs-hack.tar.gz
Alternatively you can also manually download it and extract the contents to your home folder (make sure you copy the contents of the nautilus-breadcrumbs-hack folder directly into your home folder!).
Then set Nautilus Elementary to use Breadcrumbs by going to Edit > Preferences, on the Tweaks tab enable "Show like breadcrumbs":
Finally, you may need to restart Nautilus:
nautilus -q