I was using the mod with an existing save around half way through the game and got to the part of the game in Roche's path where the Gadwall potion is required to proceed with the story. It seems if you use an existing save then it's completely unobtainable as that "Witcher Secrets" skill doesn't appear on the tree, nor is it sold by the merchant even if you disable the mod. You're basically unable to play any further after that, but it'll be fine if the mod update just adds it into your inventory.Added Gadwall potion recipy to Geralt's starting inventory. Previously it was only obtainable by unlocking Witcher Secrets skill in Alchemy tree - shouldn't be a requirement for items needed in quests.