Hi aab10,
From the screen where it detects your operating system, you will click the blue Next button and once the screen reloads, please proceed down the page to where you see Driver - Product Installation Software and you can click on the words or the plus sign to the left of them to see the one option available. Once you click on it, you will see a blue Download button and you will click that. If you're using Internet Explorer, please make sure you save the software to prevent any issues. Then you should be able to follow the rest of the document :)
If you have any other issues just let me know where and I will elaborate!