Dear friends,
I used SABnzbd+ for the
first time 
and downloaded a large file from the astraweb usenet SSL server.
This morning I found the file as FAILED with the following message "Unpacking failed, CRC error".
Upon looking at the downloaded directory, using the provided .sfv file I checked the CRC of all the RAR file parts and found out that only the .r85 file fails the CRC check.
Is there a way to attempt downloading only this file ? I really need a dumb proof guidance !

Thank you in advance.
Bob