> is it true, that WinHTTrack Alpha-7 does no longer 
continue 
> from an interupted download?
Can't reproduce the issue using the commandline version 
(linux) or WinHTTrack (windows) - do you have a 
reproductible example ?
In case of corruption, httrack is normally restoring 
(repairing) the ZIP file with a specific routine, which 
should be reliable. But the cache write flush in maybe not 
aggressive enough ? (data lost)

(By the way - activating with -%H transfer logs can be 
useful to track what was actually downloaded or not)