There is Monster Hunter Generations Ultimate on Switch, but that’s a different game. MH3U remains Wii U/3DS exclusive.
Connect your Wii U to the internet, launch Monster Hunter 3 Ultimate , and follow the on-screen update prompt. The update downloads directly from Nintendo’s servers. No need for ISO files or manual patches. Monster Hunter 3 Ultimate WII U ISO -EUR- -UPDA...
If you own a physical EUR copy of Monster Hunter 3 Ultimate, you do not need to risk downloading a shady ISO. There is Monster Hunter Generations Ultimate on Switch,
You may have seen searches for “Monster Hunter 3 Ultimate WII U ISO -EUR- -UPDA...” – this likely refers to a containing a disc image plus the 1.01/1.02 updates. While I cannot provide or endorse such files, I can explain: launch Monster Hunter 3 Ultimate