I am just getting crazy trying to download a sample pack. Before the layout was redesigned, I did it several times without any problem, but now I don´t find the button for downloading a whole sample pack at once.
When you enter the sample pack page, there is a big yellow button in the top right of the screen that says 'download'.
To get to the sample pack page, either go to the user's profile and follow the link to their sample packs. Or, on the individual sound page there will be a link on the right side of the screen in the form of a folder icon with a music note inside, this link also appears next to the sound in list view.
I hope this helped