I take the point that with a further set of arcane, non-core instructions it is *possible* to install 2.6.3 on a local server.
However, the core instructions (The Famous 5-Minute Install) do not result in an installation. For me, software that doesn’t operate in accordance with its documentation is broken.
I have now downloaded and installed archive version 2.5, which installed readily without problems. I suspect that a bug has crept into the installer routines between 2.5 and 2.6.3……