Cant update iMovie because of an error

Im using a Macbook Pro with Mavericks and I wanted to update iMovie and I cant because it says: "The product distribution file could not be verified. It may be damaged or was not signed." I tried to delete iMovie and download again but nothing works. Please help :/

These articles suggest  solutions:
https://discussions.apple.com/message/24689114#24689114
http://hints.macworld.com/article.php?story=20121012020512148
http://www.cnet.com/news/fix-corrupt-mac-app-store-downloads/
Geoff.

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