So there's some salt in the wound....
I just did the full clean install and double-clicked the DCS World icon. This sent the program out to look for updates, and I got the same error message....
Which means, unless this gets resolved I can look forward to another complete wipe on the next update.
Hopefully there's a way to salvage my controller settings and logs or I'll pretty much be giving up on anything else DCS related, like all of those other aircraft I -was- planning to buy.