Offline recovery of a multi-site installation.

Several years ago, we installed a multi-site WordPress installation for a hospital in Bellingham Washington that all worked under the umbrella of the now defunct Hinet,

I now have the server in my home office and I want to migrate everything to a new WordPress Multisite installation. … How do I do that?

Right now, I cannot access the WordPress sites at all, because the root address of does not work.

How can I work locally via