To be honest that would probably be the best way. Or they could do it as a DLC like they did with the "HQ" texture pack. Would be great imo

I'd only recommend to make a backup for pre-nextgen update version (offline installer files), so you guys have a subjectively better experience with mods made and updated prior to this "next-gen" version of Fallout 4.

I had to edit a manifest file for my steam version of Fallout 4 to prevent it from asking for new updates. I just glad I set the game to "Update when I launch this game", so I didn't have to roll it back with every WH40k mod I had installed previously.

GOG has done similar things with other games, where you can purchase the game but choose/decline a special edition upgrade, or download a completely separate normal edition instead of the "Enhanced Edition" of a game released later. In some cases these later releases prevent people from playing a game at all because of hardware requirements (and so people wouldn't buy it), so it's a really great idea.

Cool, it is own choice? Ok, how do I choose the update then? I want it, but I don't know where to choose it.

yup.

nope. they have to either remove the "creation club" stuff or package it. this takes time - especially as its tied to bethesda accounts. likelihood is theyre trying to package it like they did for the GOG version of skyrim.