Malleus

Clutching the pages from the Malleus Tinebrarum Sidhe, you stand before the very plain wooden door of 1705 Burnside with your heart thudding in your chest.  Anything could be in there. Sensible people avoid trouble. Especially the sort of trouble that means magic and mythic beings are real and aren't always enthused about humanity.

Your hand pulls back from where it hovered over the filigree brass doorknob. Images of being jumped by ogres or zapped by a fireball flash in your thoughts. To continue this journey feels like running through the lion's den wearing a suit made of lunch meat.

Before you can entertain more second thoughts you open the door and push inside.  Best to keep any potential enemies close.

The single large room you emerge into looks like it was decorated in the mid 1800s by a very wealthy individual.  The single modern item in the room is a laptop glowing brightly, open to the very web page mentioned in the old man's note.

(This very web page)

To access the online vault, simply click in the search bar on the web address. (mollyjstanton.com/pages/malleus)

Delete the word malleus (so you are left with: mollyjstanton.com/pages/)

Replace it with the password you discovered (mollyjstanton.com/pages/type in the password)

Hit enter.