What an unorganized mess. First you have to go all the way into town to pickup the actual laminated pass, which they don't bother to mention in description. Then you they hand you a 200 page booklet with details about local attractions but no detailed map AND the woman who gave me my card barely spoke English in LONDON!
DO NOT DO THIS. You are better off going to The London Pass store directly. Viator does not provide enough information on how to obtain the actual pass. And when I called they were not helpful then either. The way they inform you to use it, is to just pull up the pass on your phone... but you cannot do that without the London Pass barcode, which is not provided by the Viator link.