Internet archive seems to only have the layout of things saved (snapshot) but not the actual contents of the page.
This does not contain any of the information, just what it looked like when it was saved I believe. I am wondering if I am wrong on this.
You need a Steam account that owns the app (aka game) you want to download Quote from this thread
I would theoretically need to own the DLC for it to download. You can only download things you own on your account.