With how the game's been developing by book 4 all files will amount to 8 gb more or less, I think. Itch.io is awful to handle downloads and all download links for android users have an expiration rate after which the download stops and the downloaded content is lost. Considering that I think it would be better to have at the end of development both the full version and the separated books. It will probably amount to a lot of files in the download menu but it will help people with subpar internet connection