2.7.5 destroyed Virus Control in Logic on my Mac

[Pighood]

Joerg has been valiantly trying to help me on this matter, but to no avail...

Stared to update to 2.75 from 2.73 like I'd done a dozen times (without hitch) in previous OS versions. However, the process never fully completed, so that now my TI says that 2.7.5 is loaded, but it is unresponsive when launching Virus Control as a plug-in from Logic Studio. The window opens up OK, and the patches load, but there USED to be a start-up screen, which would prod the TI in the ribs as if to say "wakey wakey....time to subordinate to me!" In other words, there was a status line that showed up in the splash screen which is no longer there.

So it's as if my TI has amnesia, and doesn't recognize my Mac at all any more.

This info shows in the info box in the utility screen of Virus Control:

Virus TI version: n/a
Virus TI Control version: 2.7.5.0
Audio Driver Version:
Audio Library Version:
Host Interface Version:
MIDI Driver version:

This coincides with the greyed out (and presumably unavailable) first checkbox in the installation screen.

I can post screen grabs of my dilemma, if anyone thinks they can figger this thing out.

Thanks in advance.