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I have purchased an app which didn't download successfully. I deleted the installer and tried to install it again from the Mac AppStore but the download button says "Installed".

I also still have the app icon in my Launch Pad with the download progress indicator on it.

I'm aware of the option + click on the "Installed" button and on the Purchases button, but neither works.

How can I reset this download process to enable me to download the app again?

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Not sure this works, but have you tried deleting the app with something like AppCleaner and then re-downloading it? – FLY Feb 6 '13 at 15:33

First, make sure that you do not have a copy of that app on another hard drive that is mounted.

Next delete the icon from Launch Pad. It works like iOS where you click and hold on the icon until they start jiggling and then click the X button to delete it.

Quit and restart the Mac App Store.

Now you should see that it is available to download in the Mac App Store.

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Clicking the x on the jiggling icon did nothing. It just stayed there. – Hesham Abd-Elmegid Feb 6 '13 at 18:13
up vote 8 down vote accepted

Answering my own question. I enabled the debug menu and then selected Reset Application, restarted the App Store and now the Download button shows up again.

To enable the debug menu, open Terminal and run

defaults write ShowDebugMenu -bool true
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I had this because a previous version of the app was still on the drive. I was trying to re-load Windows Phone Connector 8, had to delete both WPC8 and an old WPC7 i had on the drive.

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