In 99% of cases, this error message appears because the downloaded file was corrupted in the process. This can happen due to poor internet connection, proxies, file download managers, or other factors that can affect transfer of the file to your computer. If you are on a wireless connection, you may want to plug your computer directly to your router/switch. If you are connected directly through a network cable, try swapping cables. If the issue persists, try to download the file to a different computer and then copy the file over to your original computer using a thumb drive or other similar method.