You may need to have a Kindle device to download the book to, but they offer a lot of free ones, not just the e-reader itself.

here's the full list of Kindle-for-whatever. Download whatever one matches your computer system and link it to your amazon account, and you should be able to download Kindle books to it.

The book will probably be DRMed to be Kindle-only, but there are ways around that; see this post for info and links