Mac App Store: Cannot update App Store purchases or updates do not seem available

After you purchase an app in the App Store on your Mac, you may not be informed when updates are available for your purchase. Additionally, when you attempt to download and install updates, you may receive a message that states "There are updates available for other accounts. Log on to update the program with the account with which you have purchased it."

This may occur if you have Spotlight indexing disabled on your startup (boot) volume. The App Store uses Spotlight indexing to know when applications have updates available and to process those updates.

To resolve this issue, re-enable Spotlight indexing on your startup volume:

  1. Open System Preferences from the Apple () menu in the upper-left menu bar.
  2. Choose Spotlight from the View menu.
  3. Click the Privacy tab.
  4. Remove your startup volume from the list by selecting it and clicking the minus (-) icon in the lower-left corner of this window. 
     Click the icon in the lower-left
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