i have not properly explained myself.
i know already use get separated files option 
pasting 'url errors' found in hts-log.But when i see a 
missing link at a page i'm interested in, i don't know 
if that's an error.it may be a file not downloaded in 
a huge project which shows a 0 bytes size in 
winexplorer.
It coud be great files i try see was marked in project 
structure shown in winhttrack,then program could let 
me say it to download later by right click.