"Скачать книгу: Трансформаторы." (Download book: Transformers.)
"Я хочу скачать книгу про трансформаторы." (I want to download a book about transformers.) kniga transformatory skachat
If you are looking for a way to turn that search query into a proper, natural-sounding sentence in Russian, here are a few ways to phrase it depending on what you need: "Скачать книгу: Трансформаторы