[HOW-TO] - Update Manually Nexus 7 (2013) with Android 4.4 KitKat

If people decided not to wait for OTA. Copy the update zip to virtual sdcard, then boot to recovery (TWRP), choose Install, select the zip file, then swipe to install. Also, prior to reboot you need to install SuperSU 1.69 to preserve root and TWRP recovery.