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Adoooooooo
You have a couple of options to make it work from what I understand (if
applicable)
1) Redownload your file. Perhaps due to some network complications you
weren't able to get the entire file.
2) Download the PAR file within the set of RARs you donwloaded. If this
wasn't provided then you may be SOL. Might ask for the person to repost
what you need.
Good luck!
Big D