Saturday, I found that I've lost the ability to print from Adobe on this machine because of the aborted update -- I get a memory access error. So I'll have to get this figured out.
Update (Jan 16): It's looking as though Adobe won't update now on a home machine with only an unprotected default user of "Owner" in Windows 7. It looks like a pw-protected Administrator has to be set up. Maybe that helps explain why the legacy Webroot firewall suddenly started blocking everything last year. Will look some more. Adobe's explanation is here.