So when "Continue interrupted download" is selected but all files get
redownloaded and the log contains "**:**:** Warning:  Previous file not found
(erased by user ?), recatching: *******" for all the files, what does that
indicate?
On a whim, I checked "Do not redownload locally erased files", and while the
log entries changed from "recatching" to "ignoring", Wireshark still shows
HTTrack as downloading those pages. Interestingly, most but not all of the
binaries are not redownloaded, showing "Null-size file not recaught" in the
log instead of "engine: transfer-status: link added..."

I'm using 3.43-4. I'll upgrade to -7 to see if a newer version fixes the
problem, though I don't see anything in the change log.