It’s been a while since that leaked 4.3 rom for Nexus 4 is out in the wild. There are many guides out there which takes you through the steps for installing the rom on your device. I personally followed this guide to install it on mine. Since the download link mentioned in this post seems very slow, I resorted to Google to find if any other mirror is available to serve the rom. I strongly suggest downloading from this link instead, it’s fast and doesn’t seem to be overloaded with requests as of now. Also I followed this guide to boot into TWRP recovery instead of flashing it and replacing the stock recovery. Remember that this won’t flash your data but you should use the backup options available in recovery before flashing the rom.