Note: After downloading the file, install the file by double clicking it. When installation is completed, open the "Kindle" app on your desktop by double clicking the "Kindle" icon. It shall ask for registeration, simply sign in with your Amazon account and your PC Kindle will be registered. After registering your device, you can buy the book at Amazon site and it shall be downloaded in your Kindle PC.
Note: When you sign in first time, it shall pop for "Offline" support. If you go for it, "Kindle Cloudreader" app shall be added in your Chrome browser that can be accessed by clicking "Apps" in the top left corner of the Chrome browser.
Note: After installing Kindle App, open the App and sign in to your Amazon account to register the device once. After registeration, you can buy the book.