Step 7) After Unzipping the file, you will see several files, delete all the other files EXCEPT for the one named rar form, (to download, just Google, and click one of the first few links, the program is free) Step 6) Unzip the file, if you do not have any tools to unzip the file, download, as the file is usually downloaded in.
Step 5) Save the download file to a place that you can find it, e.g. Step 3) Scroll down the page, and click on the Link Folling instructions would help you download the map: