That's curious; all 3 versions should be available.
Unless this is an Android issue? Book 3 is 10GB, while Android APKs need to be <2GB.
Shouldnt be an android issue since i try to install it to my PC. But Book 1 is also not shown up in the installation menu. Only the two Windows versions for Book 2 are shown. Im trying to install it with the itch app because the download never finishes and sadly the Steamkey was only for Book 1 too, which i already own there.