1. Why does my game crash before I've even started the game?

You are likely experiencing this problem because of one of several reasons. It could be interference with another mod, the fact that you did not let the mod load correctly, that the mod is not at the top of your load order, or that you have not completed Dragonslayer (the final quest in the Main Arc, when you defeat Alduin in Sovngarde). Try changing your perfomance settings as well.

*Please note that Dawnguard is required for this mod to work.

2. Where is the Hall of Dovahndor located?

Fast Travel to the Throat of the World. Approach Paarthurnax and make a left. Behind the mountain peak (that you can climb to retrieve the Notched Pickaxe) is a row of towers topped with flags and braizers, as well as an arched entrance like those you'll find in the Forgotten Vale. Enter this arched entrance and you should successfully arrive.

3. How do I find the Underdepths and the Hall of Shadows? (SPOILERS)

A much-asked question, the Underdepths is a very difficult find. If I told you that you've been walking past the entrance ever since to started exploring, would you laugh or cry? I happened to stumble across it... literally. Please note that this could be a massive spoiler for many, so proceed with caution. Also, make sure you have something enchanted with a waterbreathing spell - there's some swimming involved.

Go to the Hall of Magic, where the massive garden and Jurgen Windcaller can be seen. Stand in the corner where the enchanting table is placed and face the garden. You will see a pool in this corner with some salmon swimming in it (I dropped in to try and find a key... I found something else). When you drop into the pool, look to your right. You will see a trap entrance much like the Thieves Guild entrance, boarded over with wood. Moving closer to this will reveal the unlocked entrance to the Underdepths.

Upon entering, you will be faced with an underwater maze that becomes easy to naviagte if you have something to keep you from drowning. You will see a set of stairs that lead into a large and rather cozy area. There are some locked doors that will take you further into... the Hall of Shadows. I hope this helps you out!