Mac app store won't update or download ANYTHING

I had a similar issue with OneNote. The solution that worked for me was to delete OneNote completely and install from new. I know this is not an option with every software (for examples software suites containing significant locally-stored data), but it did work well for me.

nbar: I know this is an old post but I am updating a mid-2009 MBP (El Capitan) for a friend and ran into this problem. I spent two hours trying everything. Your solution worked so thank you very, very much!!

I couldn't get the debug menu to come up but after some research and inspection of the terminal command, and please correct me if this is wrong, but I believe it is:

defaults write com.apple.appstore ShowDebugMenu -bool true ; killall AppStore ; exit

Hope that is helpful and thank you!

Can you update apps in both user accounts?

That's unfortunate because having another account to test with helps.

Reason being, if you have the same problems in both user acocunts, it's can be an indication that the startup disk needs repairing.

You should do this on a timely bases regardless.

Launch Disk Utility located in HD > Applications > Utillities

Select the startup disk on the left then select the First Aid tab.

Click: Verify Disk (not Verify Disk Permissions)

If DU reports errors, start up your Mac install disc to make repairs and restore 10.6.

Mac OS X v10.6 Snow Leopard: How to Erase and Install

The spotlight trick just reindexes your volume. This wouldn't be the cuse of your problem.

I can't see the screenshot, but first try the following:

Open Terminal Application. Copy and paste the following command into the command line prompt:

defaults write com.apple.appstore ShowDebugMenu -boot true ; killall AppStore ; exit

Open the App Store Back up. Sign out of it (Store > Sign out). From the Debug Menu, choose both "Clear cookies" and "reset application"

Next,

Open Finder, from the menu bar Go.. > Go to Folder...

copy and paste the following path: ~/Library/Preferences/

Delete the following two items:

com.apple.appstore.plist

com.apple.installer.plist

Reboot your machine and see if the problem persists.

Did you update the Apps with the same Apple ID?

Try my second suggestion FIRST, then subsequently try the first suggestion if it does not work.

Did you navigate to ~/Library/Preferences/ Make sure to include the "~". Do you see property lists there? com.apple.appstore.plist will be there.

You need to enable the debug menu via the terminal command.

Good that it's isolated to one account ...

Try deleting the cache associated with the App Store.

Quit the App Store if it's open.

Open a Finder window. From the Finder menu bar click Go > Go to Folder

Type or copy paste the following:

~/Library/Caches/com.apple.appstore/Cache.db

Click Go then move the Cache.db file to the Trash.

Relaunch the App Store to test.