The Mac App Store can recognize applications you already own – even if you didn't purchase the application through the Mac App Store. For those apps, you'll see "Installed" instead of "Buy" in the App Store.However: the Mac App Store only recognizes previously installed applications if they have the exact same version number as the version that is in the Store - so in some cases it might not show up as installed.
Unfortunately applications not purchased in the Mac App Store can not be updated through the Mac App Store, even if it recognizes them as being "installed". But every equinux application has a built-in update feature - just choose "Check for updates" from the application menu.
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