stairs to get upstairs in fort dawnguard?

Answer 1

When you enter the front foor of the fort, the stairs are directly through the archway on the right hand side of the circular entry room, right across the hallway. You;ll see them through the archway if you stand in the middle of the entryroom and turn right to face "east" (PC).

THere is another set of stairs down the hall that leads to the ramparts, but as long as you turn right from the main entry door and go up the first set of stairs you see they should be the right ones.