Doesn't work. DU and "that site" have been shut down since your message. No results on NGR at all. It is nigh impossible to find the 3ED v5 without someone (like you) with the source directing us.
EDIT: For those looking for anything, I managed to find V4. duckduckgo: "dragon_quest_8_3ed_eur"...
I had to reset my password to access this forum for the first time in years JUST to post how much better gameyob is than lameboy.
Blows lameboy out of the water in pretty much every aspect. Can't believe I was still using it. Big thanks to Drenn