It was really easy to collect the tickets, we then had access to three attractions - old synogoue, eagle pharmacy and schindlers factory. The latter 2 are wonderful museums, probably the best museums I have ever been to! We learnt so much, from before the war to when the war finally ended and the camps were liberated. A must visit if you are in krakow and such good value too!
The ticket received was made to look like an actual ticket BUT in very small lettering it says it is NOT a ticket but you have to print off the actual ticket OR go to the nearest viator office to redeem it. We were almost turned awsy from the attraction as we thought the downloaded ticket was the actual ticket. Needs to be much clearer OR dont make it look like an actual ticket that is sent to your phone !
Despite following the instructions , the museum would not accept the e-voucher issued by Viator. We had to pay again to visit the attraction which was a very worthwhile visit. I would recommend taking a guided tour. The only disappointing aspect was the failure of aviator to respond to email about the e-voucher issue