Send an email to support@efilive.com, I believe this is still a free enhancement so they just have to generate an auth code for you.
Correct, 4 licenses would be on your V1 originally plus free LS1A tuning. When you purchase a V2 upgrade, it will come with 2 VIN licenses + free LS1A stream. When you go through the upgrade process (required to activate your V2), you have the option to keep OR move the existing unused 4 PCM licenses AND copy the used PCM licenses (not applicable as you don't have any used licenses) from your V1 -> V2. This is a ONE TIME deal, if you don't copy/move them, you can't do it later. You can only move licenses from V1 -> V2, not from V2 -> V1. You do not get to keep say 2 PCM licenses on your V1 AND move them to your V2 as VIN licenses. Remember, once you upgrade your V1, you cannot purchase additional V1 PCM licenses so if you wanted to use the cable in the future, you MUST leave PCM licensees on it during the upgrade.
V1: 4 PCM license available, 0 used.
V2: 2 VIN licenses available, 0 used.
After V1 -> V2 migration:
V1: 0-4 PCM licenses available, 0 used.
V2: 6-2 (2 existing + # moved from V1) VIN licenses available, 0 used.
Personally, since you have a single LS1A vehicle, I would move all to your V2 as all vehicles since then you have 6 VIN licenses applicable for all supported vehicles vs licenses you can only use on controllers up to 2005. But, it's up to you!