The instructions for downloading the Google Application is really simple. As you get to the address, you will find that the download will include Google Chrome too. This is actually a web browser. If ever you are already using this web browser or you don't wish to download it, you can uncheck it and hence not download it.
Please do have a look at the Terms of service for the application before having it downloaded. This is essential. For having the software downloaded, simply click on Agree and Download.