There is no such thing as a stupid question here as long as it pertains to using NewsBin. Newbies feel free to get help getting started or asking questions that may be obvious. Regular users are asked to be gentle.
Pretty much all files are yEnc encoded and have been for at least 5 years now. I suspect whatever problem you're having, it has nothing to do with whether it's yEnc encoded or not. If the files are turning red and the logging tab shows "430" errors, it means the files have been removed from the news server already.
i get this download failed file retry count exceeded or this unrar failure password no found
You're downloading encrypted files but you don't have the password. If you're using 6.81, you can select the file then Ctrl-R to read the status. It should tell you if the file is encrypted or not. So, this has nothing to do with yenc as I suspected.