Hi,
I keep having problems with the mac app store. I'm running OS X Mountain Lion on a MBP mid-2010.
Everytime I want to update my apps in the Mac App Store I get "Error 20".
I've searched the internet for any solution, but most solutions are for error 13 or 100. I can not find anything that fix my problem.
What is a particular solution for error 20?
Thanks!
MacBook Pro (15-inch Mid 2010), OS X Mountain Lion (10.8.1)
Open System Preferences > Security & Privacy then select the General tab.
Click the lock icon to make changes.
Now select: Mac App Store and identified developers
Click the lock to make changes.
Make sure you are using the same Apple ID used for the orignal purchase of the apps for updating.
This won't work.
The settings were already on 'every source'.
You're certain you are using the same Apple ID the apps were purchased with ??
Yes, I'm sure.
Disable anti virus software.
Try turning off the Firewall in System Preferencs > Security & Privacy
Same for a router.
Apps such as Little Snitch can prevent apps from updating.
I don't have any anti virus software.
The firewall is already turned off.
There is a router, but the router settings are no problem for other macs in my network with app updates. So this shouldn't be the problem.
Make sure you have the App Store set to the correct country.
See the round flag icon bottom right of the App Store window.
These settings are also good.
I found this while experiencing the same error. Try signing out of your account in the App Store, then sign back in. It asked me to verify my payment information before it would let me update. If you don't have a credit card on file, just select "none" then scroll down and confirm the settings.
I already logged out several times, but this didn't help either.
Hi,
I got the exact same error code on my mbp, It seems to occur only with apps I purchased from another user account on my mbp (same apple id). Is it the same for you ? Still not solved my problem, but it could be the start of a clue ?...
I also have the same problem and I also can update my apps from another account I created for my girlfriend. Strange though as this new account was created recently so the apps were originally downloaded from mine.
I find it to be an annoyance to switch accounts to update my apps but this is my work around for now.
I just recently had to change my password info
So I was getting this error too, I came here and remembered that I had done that when that one comment said to sign out and sign back in
i did that and now all the apps are updating fine...
Hope this helps
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I was getting the same error message too so I came here. Then I remembered that I recently had to change my password for my Apple ID. When I went into the App Store I signed out then signed back in again with the new password and it is updating fine now. Hope this helps!
mac app store error 20
