OK. I also wrote a guide for installing TWRP on Quarks (Moto Maxx/Moto Turbo).
Since you have already unlocked the bootloader, the TWRP installation part is the same on all Quarks.
Go to here and read Section 2:
UPDATED GUIDE: How to unlock your MOTO MAXX/MOTO TURBO bootloader/install TWRP/root
https://forum.xda-developers.com/moto-maxx/general/guide-how-to-unlock-moto-maxx-moto-t3455341
Section 2 deals with installing TWRP. You are free to use the remaining sections also, as they will also work for you, now that your bootloader is unlocked. But read Section 2. It contains basically the same information as
@TheSt33v's guide, but is written in a different style. Sometimes reading something a different way will trigger an "aha!" moment.
Again, the only material difference between
@TheSt33v's guide and mine is his deals with how to unlock the bootloader (via Sunshine) on the Droid Turbo XT1254, while mine deals with how to unlock the bootloader on all the other Quarks. But, after that, TWRP, rooting, replacing the bootloader warning graphic, etc. is the same on all Quarks. I just write my stuff in a way that is very in-your-face, because that's the way I like to have stuff taught to me.
Anyway, take a break, then go read my guide, see if there's something you've inadvertently skipped.
For instance, you have moved the TWRP file to the same folder where you are generating the command window? It has to be IN that same folder. You can SEE the TWRP.img file IN that folder? I would even suggest you take a screenshot with Paint and post it here, so we can verify that.