Hi! I finished the free sample of the Atomic Kotlin book just yesterday, but today, as I wanted to buy the full version to continue working on it, it isn't available for purchase anymore (via Stepik, it says "You cannot buy this course yet."). I could swear that it was indeed available all the time I've spent working through the sample. Does somebody know by any chance if the book is discontinued or if it will be available again?

Try https://www.atomickotlin.com/ebook/