-refuse to haul downstairs
are you digging a downstairway on the top level and 100% sure you have connecting up or up/down stairs on each level?
-My miners had no problem going downstairs why would rest of crew refuse to go down?
idk it sounds like your miners are getting rid of the stairs which lead back outside, or your using channeling to go down, which is a one-way deal. don't use channeling for that.
simple version, designate a downstairs (J) on the outside level, then X's (up/down staircase) directly below that, going down for the needed number of levels. Then mine rooms out on each level. all the rooms will be connected via the central stairway.
One fix for if you accidentally remove some carved stairs is to get a miner to build a new constructed staircase out of a boulder to replace the one you accidently mined.
I downloaded Masterworks about 3 weeks in to get very old version of LNP, Since then I have probably downloaded in their own separate folders 2 updated versions of LNP, the Fantastic mod and Reborn mod.
All I can say is I have read, sought out whatever info about how the game should work and how I should play it, and I got no clue about how to fix the thirst and few other things like zones not working and stockpiling and dwarf's gone buggy.
I am annoyed.
Nothing's buggy like that you just don't know the basic commands. I know this because 1000's of other people play the game and nobody else is complaining about those bugs. Stockpiles work, zones work, stairs work. There are basic tutorials around that show you exactly what keys to press and what to do to get a basic fortress running.
Maybe start with just vanilla DF and go for mods later. The less extra stuff you have to learn at the start, the better.