The interface looks to be using the same base as the other
Essence Interface source that was shared not so long ago. This one is just a reskin with several add-ons. As such, you can use the parts you like in this one and add them manually to the other version.
Meanwhile, there are several glitches that I've stumbled upon, even though I only spent less than 10 minutes tinkering around.
1. You cannot exit BIG-SCREEN mode on the Mini-map. When you do, you can no longer open the map.
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2. The skills menu is not dynamically resized.
3. The AUTO-BUFFs are supposed to allow you to pick a target, but that doesn't work.
4. The NORMAL DAMAGE on screen does not show, even though it is showing properly on the other Essence interface I mentioned earlier.