Download And Install Android 4.3 On Nexus 4 Right Now [Leaked Build]

Step 1: Flash TWRP by using the Nexus 4 root toolkit.
Step 2: Download the flashable ZIP file from here.
Step 3: Connect the Nexus 4 to PC and make sure that you have Android SDK installed with ADB configured. Follow our guide on how to set up Android ADB and Fastboot on Windows.
Step 4: Reboot the Nexus 4 into Recovery and wipe cache and dalvik cache.
Step 5: Since you’ve already moved the ZIP file to internal memory of the device, just flash the ZIP as you would do any normal one.
Step 6: Once the flash is completed, reboot and voila! you have successfully flashed leaked Android 4.3 on your Nexus 4.