The Winter Update currently only contains the winter holiday content. The winter event will be available until early January and then it will be temporarily unavailable while we work on making it into a permanent DLC and adding a toggle on/off feature for the seasonal content included in it!
The Halloween Content is not available for permanent download yet! It is expected to drop in Q1 of 2023. More details to come soon on this - especially as it pertains to the Itch.io platform!