If you can, try to post the error message. It will help to determine if there is something wrong or just a warning. I´ve had several packages from the Power Pack Club download ISO´s display a message that packages and liibraries had bad signatures but they would install fine. I´m not using them anymore but I think it was just a message that the md5 of the files on the disks were different then the md5 on record for that application.
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