Can't update SQL Server 2008 to SP3, it only offers the option to create a new instance

Question

A colleague is attempting to update our server's SQL Server 2008 version 10.0.1600.22 (not R2) install up to SP3. Unfortunately, we can't work out where the "Update" button is; the installer seems to be set on creating a new instance, which isn't what we're after.

Windows Update doesn't seem to be finding the update either, so we can't do it that way.

What are we missing, here?

Answer 1

I suspect you are using install media not a service pack installer. Download the service pack executable and try again. Windows update will only show it if the "get updates for other Microsoft products" option was chosen.