HT202159 Why can't I download anything from the  Mac App Store?

I cannot update apps, or download  Mountain Lion. It spent time downloading, supposedly, then after it was finished it said it was unable to do so. Tried it three times, same result.
Never experienced this before.

I need to clarify the problem:
software update returns:
The update could not be verified. It may have been corrupted during downloading. The update will be downloaded and checked again the next time that Software Update runs.
The Mac App Store update, download new, or resume returns:
The application you tried to download could not be downloaded. Check your internet connection and try again.

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