it exists if you read the instructions. The trainer requires you purchase and enable the Gathering Storm expansion.
There will be no trainer for the free Epic vanilla version of the game, sorry. Go buy the Platinum Edition upgrade and the trainer will then work.
Civ 6 ridiculously uses multiple .dll for various versions of the game. We do not have the time nor the willpower to make 4 different trainers and update them all each time this dog patches. Install the latest expansion and you will be golden.