Just so there's no misunderstanding, purchasing the DLC will only add additional 18+ content to the base game. Due to this, the DLC has nothing to do with the full version 14DWY, which will remain free once it's complete.
If I've misunderstood, please let me know! I also suggest checking out the DLC page if you need more information on what's included in the demo/free version and the paid version.