Root for 4.3 leaked Nexus 4 version.
Enable USB debugging,
Put the file in the SD Card
Reboot into recovery
Wipe dalvik cache
Install the zip file
The recovery will prompt you that it will be needed to remove the stock recovery, skip it or say yes
The recovery will try to fix root. Say yes and reboot.
All credits to chainsfire for the rootes method for GALAXY S4 4.3