High Sierra

[Dave Horsfall]

macOS Sierra 10.12.6, MB Pro 13", Mid 2010.  8GB mem, 480GB SS SATA drive.

I'm starting to find that this old MacBook Pro needs High Sierra for 
various reasons (printer drivers etc), but Cupertino seems to be keeping 
its location a secret.

So...

a) Where can I find it?

     and more importantly:

b) I take it that MacPorts will have to be download/recompiled in its 
entirety?

After that I'll start attacking Xcode (long story).

Thanks.

-- Dave