[Q] Unlocked/Rooted with S-On want OTA topic

I would like to install the AT&T OTA of 4.4.2 but have a custom recovery and am unable to upgrade. I am rooted with the stock 4.3 ROM and have the twrp recovery installed. I have S-ON. I've searched around trying to find a way to get this to work but can't seem to figure it out. I've tried looking around for an AT&T 4.3 stock recovery to try and flash it but can't seem to find one. The one from the Dev sticky page is not available for download. Can someone detail the steps I have to perform to get the 4.4.2 OTA from AT&T. Thanks in advance.