Wanting to update the Samsung Software

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http://forum.xda-developers.com – A system update keeps on popping up on my screen, when i do the update it goes into download mode.... It starts the download and right away it gives me an error message. "CWM -based Recover V5.5.0.4 Finding update package... opening update package... verifying update package... E: failed to verify whole-file signature E:Signature verification failed Installation aborted." Do i just have to download and manually update it? I forgot to add that i have the custom ROM "AndaKonda" (HowTos)