Hello,
Sorry abut the delay in response. File attachments for devlogs are a way of saying "this file is associated with the information in this post." It does not make those files for download on the devlog page. The most recent version of your game will always be available or download by going to your project's download page. We did this because we want to have a centralized place for someone to download the game, it would be confusing if there were different versions of files floating around on different posts.