This is an old question, but still some users feels confusion about this.
As we know sky3ds/sky3ds+ is a line of flashcarts which can pretend that the device(card) is genuine game card, using cartridge emulation to work for all 3ds roms.
(one more word, cartridge emulation is better than software exploits like their competition, which won’t impact the function of your console.)
So we can download the dhl for 3ds roms to work on sky3ds/sky3ds+ as the original card, to get it in normal way from the “dlc” or “additional content” menu in the game or from the Eshop to buy it or for free.
an old video for this . for more please click here