Here's where I've got to...

My conclusion is that Squeezebox 7.7 is a no-go area on Windows Home Server. It requires MS Visual C++ 2010, which is available as an .exe file, but not a .msi file for WHS Add-In. A user's post at the Squeezebox Forum was answered by Logitech with a link (including ID code 5555) which, for me, downloaded the .exe file.

Fortunately, I'd kept a copy of the Squeezebox 7.4 .msi Add-In, so am now restoring to that version.

| Music: NAS/Squeezebox Touch & Linn Axis/562V.2 -> DSP5200s
| Movies: G98DH -> 568.2MM -> DSP7000s, DSP5200HC, DSP5000C x2 rears, M2500, DVDO iScan VP50, LG 60"
| Humax FreeSat distributed to Cinema + two TVs