It is possible that the download link provided above does not refer to the intended version.
If you are looking for Microsoft SQL Server 8.0, you may try searching for a download link using
Google.
Microsoft SQL Server 2000 has version numbers starting with 8.*, Microsoft SQL Server 2005 has
version numbers starting with 9.*,
Microsoft SQL Server 2008 has version numbers starting
with 10.*.
They are different products, if I have installed MS SS 2005 (9.*), doesn't make
sense for me to get a warning now that 10.* is out on the wild