My apologies for not responding in time, the DLC isn't free and is an exclusive benefit, but the internet always finds a way to leak it to the public. When I say moonrunes, I mean that the DLC is still in Japanese, just a term I picked up when I was younger.
You place the DLC into the main folder (WIN), the DLC is merely image files, game is programmed to give you the item when you put in the code in-game, you can find the codes all throughout this thread but I can provide it if you need it.
To recap, DLC 3 is not translated and DLC goes into the main game folder, it's only the images needed to get the items without errors.
Stay safe out there and good night/day!
Till next time.