What is an error (18) from Mac App Store?

I have tried everything under the sun, can not get MAS to update my iPhoto and iMovie on an Xserve. Always get an error (18) but no clue what that means.

If you originally installed iPhoto from an iLife DVD, or if it came preinstalled on a Mac that shipped with installation discs, then you can't update it in the App Store. Depending on what version it is, there may be an updater you can use on the Apple Support website. Otherwise you'll have to purchase iPhoto from the App Store.

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Same problem here in Brazil.
It seems to be a problem with logging in App Store in the Mac (Yosemite 10.10.2).
When I tried the very same userid and password I was able to login in to use my iCloud account from the same computer and also from my iPhone.

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When I try to download an app in the Mac App Store I get an error message: "We could not complete your purchase. Error Unknown." Sometimes it says: "There is an error in the Mac App Store". This has been going on for a couple of days now. I have tried signing out of the Mac App Store, logging out of my User Account, and then signing back in, as has been suggested in other threads. But that did not work.
Suggestions?

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How do i fix error message that says "the product distribution file could not be verified. It may be damaged or was not signed." when trying to purchase from Mac App Store?

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We could not complete your request. there was an error in the Ap Store. Please try again later (13) .
please help me with it guys i did every thing change the account to another, change the app that i want to download, ...... ETC !
i hope to find the soultion fast
Cheers :*

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We could not complete your request. there was an error in the Ap Store. Please try again later (13) .
Third party application enhancers such as Little Snitch, Peer Guardian, or anti virus software could be preventing access to the App Store.

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anybody know the solution?
thanx
Neta

Hi there, I am having the same problem, but with Error 13 instead. I can see apps I've downloaded in my purchased apps, but when I try to install them that's when I get the error message. See attached image!

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kMDItemAppStoreHasReceipt=1
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When I try to update from 9.1.5 to 9.2.1, I get the message: "The version of iPhoto installed on this Mac must be updated through the Mac App Store."
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Terence and Peter,
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hth, Bob

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Hi All
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[email protected]

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It will not go to the Mac App Store
I have a MacBook Pro 2010 intel
os mac mountain lion 10.8.6 however I do not have the original copy that was downloaded from the app store when I bought it.
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I had dowloaded and used before, but recently I reinstalled the Mac OS.
When the download reachs amost 10MB, it restarts a few times and gives me the message: "Pages failed to download. Use the Purchases page to try again."
I tried both two following methods:
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Click on that and press "Reset Application"
Restart App Store.
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Step 1
Rebuild the Spotlight index. If you try to search now from the magnifying-glass icon in the top right corner of the display, there will be an indication that indexing is in progress.
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I am running OS X 10.6.8 on a MacBook Pro less than 3 yrs old.
I have 2.66 Ghz Intel I7 processor
4GB memory 1067MHZ DDR3

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King...
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What is an error (18) from Mac App Store?

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