Converted to DE, trouble flashing TWRP

My phone confirms "mode: Developer" so I know that I had success with the conversion, but I can't get TWRP to flash for anything! I tried ODIN. Samsung drivers definitely are installed and reinstalled, via separate and again with Kies to be certain: wasn't the issue.
Here's what happens when I boot into recovery. It says "Installing System Update." Then "No Command." And then it goes to Android System Recovery despite what Odin says are successes.
I just got this phone, and it had 5.1.1 already installed. What I've gathered by now tells me that that may be part of the problem. KingRoot stopped working since the conversion so I can't try the Play Store TWRP Manager... :/
I'm looking at the thread for the safe upgrade to LP 5.1.1 right now. It has a flashable for dev-ed to bounce back the bootloader? I'm in over my head right now. Time I start asking questions.

Thanks for the help guys.


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