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If setup correctly it should auto fill the missing parts. I'm guessing you need to change a setting to make sure highwinds is set as your primary fill server.

I never really liked Newzbin. It has lots of files, but seems unorganized to me. I can never find what I am looking for there.

Try a block account or free account. There are a few free ones which have GB limits/month but they work great for fill servers.