If you receive "corrupt installation detected" when running the installation, then the file was incompletely downloaded. This happens from time to time. Unfortunately, attempting to download it again will usually result in the browser cache handing you the same, corrupt file again (but much faster!)
So go back to our download page, and download again but this time use the "Secondary Site" link. This will confuse the browser, so that it won't give you the same incomplete file again.