Why Mac App Store cannot resume broken transfer?

Why Mac App Store cannot resume broken transfer?
Everyday I start download of xcode, at the end of day it archived several hundred MBs, but the next day the download start from 0 again, it took me two weeks and I'm still trapped in this!

Quit the App Store if it's open.
Open System Preferences > Security & Privacy > General
Click the lock icon bottom left corner of the pane. You may be prompted for your admin password.
Select:  Mac App Store and identified developers
Click the lock icon to prevent further changes.
Relaunch the App Store. From the App Store menu bar (top of your screen) click Store > Check for Unfinished Downnloads or follow the insstructions here >  Mac App Store: How to resume interrupted downloads
If you still have problems ...
-  Temporarily disable anti virus software if installed
-  Apps such as Little Snitch, Net Nanny, and Hands Off can prevent apps from downloading
-  Third party download managers are not compatible with the App Store.

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    If you've moved to a different country, select
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  • Why does Mac App Store log me out in the middle of a download of Lion and "resume" won't work?

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    but is failing for a White Macbook (running Snow Leopard 10.6.8)
    Launch iTunes. From the menu bar click Store / Authorize This Computer.
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  • After upgrading to mavericks, i cannot open mac app store, preview, calendar, etc

    Why i cannot open mac app store, preview, calendar, software update, etc after upgrading to mavericks? How can i fix this? please help me

    Please read this whole message before doing anything.
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  • 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:
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    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.

  • HT4461 Why do I have to repurchase apps I already own through the Mac App Store to get updates there?

    It's a simple question but I cannot find an answer.  I just know you can't. It makes no sense to not allow us to even purchase an update at a lower cost as opposed to repurchasing the app from the app store at the full cost.  Can anyone say why this is the case? It makes me not want to ever use the app store.

    I get that, but that's not the point.  What I am saying is that the customer experience is poor. It should work the same as it used to when you bought software from a brick and mortar store.
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  • Why use mac app store

    ok so I have been looking for an article as to why one would want to use the mac app store as oppsoed to just finding what you want online.
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    And it updates through the app store... but sometimes I see apps that dont update on the app store but DO update on the website.
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    ok so I have been looking for an article as to why one would want to use the mac app store as oppsoed to just finding what you want online.
    You are correct that downloading from the App Store is safer. Apps in the App Store have been "cleared" by Apple, and they also have to abide by strict sandboxing restrictions (which limit what the apps are able to do). Although that's not a guarantee that an app couldn't do something sneaky, it certainly does limit the possibilities and makes it very unlikely that this would be a concern.
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