Ok first off I want to say that I want to complete the quest, not skip it and move on to Reaper's March or whatever.
So as many of you know this quest is near impossible to complete. I've reported the quest via the customer service menu in game. Since then I've emailed them back in reply to see if there was anything that could be done while we all wait for them to fix it.
First response was that they knew it was a problem for some players and they were looking into it. So I asked if there was a way to complete it before they patch it, and the second response was that we must allow the NPCs to travel downstairs or I could skip it and go to Reaper's March (which I do not wish to do). Third response was to come to the forums, which is why I am here now. Fourth response was to enter the room and log out and log back in. Tried that, didn't do anything, I returned to the room full of players.
I've also tried some advice from other players either via voice chat or from websites. One being everyone has to stand by the door and wait for her to walk down stairs. That is near impossible because there's always players who don't listen and agro her and she dies. Although there was one time were we did get everyone away from her and we waited a few mins and she just stood there and did nothing, and eventually someone ended up killing her. Another attempt was a group of us all joined a group and walked out to the tree, but that method didn't work either.
I've noticed there were two situations I found myself in. Either it says "Defend the Silvenar", which he is located downstairs floating, and says something along the lines of people not liking Bosmer or something. This situation the captor does spawn but everyone kills her. Another situation I've found myself in is the quest saying "Defeat the Silvenar's Captor". This situation, the Silvenar is not present in the room at all, not even down the stairs floating as said previously. She also doesn't spawn at all. I don't know if there is a difference between these two situations, but I thought it would be worth noting.
So yeah here I am, since Customer Service was unable to help me, and they told me to come here, I figured I'd take their advice and come to the forums. I'm new here so if there are like a million post just like mine, I apologize in advance.
So I'm either hoping that they make this quest completable for everyone when the captor dies, or they make it a solo area so the quest works out as it was intended. If there are any fool proof ways to complete it that I have missed, please share. But otherwise, it's pretty impossible with the amount of players that are in the room at all hours of the day.