This firmware is for the xt926 and is not interchangeable. Do a search for xt925 firmware for your location. You will have a better chance of finding it outside the U.S. Here is a link that might help:
That error looks like it came from twrp recovery. You can't flash the zip in recovery. Setup HOM 4.3 exactly as it says in the instructions. Download the snapdragon support tools for that phone in the HOM OP.