Okay so actual ticket for Dark Harbor acquired easily. Today had sent a link to access the ticketing page to "redeem your voucher".
What was interesting is you chose a "timed entry", but the earliest time was 8pm. However, $10 upcharge, you can get "early entry" (allowing me to enter at 7pm).
There were a bunch of "upcharge experiences", including the cabanas & VIP "upgrades".
Without the presale voucher code, you'd end up paying for your ticket a 2nd time. The code counts as a "discount", once applied, I only had to pay the $10 for "early entry".
I'll be going Wednesday, Oct 9th 2024.