When downloading a website for a long duration, my PC crashes. However, the
files which were downloaded before the crash are intact but when I continue
the interrupted download WinHTTrack re-downloads the entire site again.

The Following is the error I get when I try to continue the interrupted
download.
21:30:09 Warning:  Cache: damaged cache, trying to repair
21:30:09 Warning:  Cache: could not repair the cache
21:30:09 Warning:  Cache: error trying to open the cache

All the files are intact but it seems the cache is damaged.
How can I download from where I left off.