HT201413 I get error 20 when I try to download updates to installed Apple software  I have two users on the IMac. I resolve the problem by clearing all cookies on both users Safari. Why do I need to do this? What is going on?

I get Error 20 when I try to download updates for installed Apple apps on my IMac.  I have two users on the IMac, and I resolve the problem by clearing all cookies on both users Safari, opening and closing the App Store for each user, shutting down and restarting the IMac for each user, until finally the download works. There must be an easier way.  I also have an Air, where I have no problems whatsoever. Both machines have Doorstop and MacKeeper with the same settings, so I have ruled those programs out as the cause. I believe iot is because I have two users - any ideas?

Please read this whole message and be sure you understand all of it before doing anything. Back up all data before making changes to your settings.
Write down the server addresses.
Click Cancel to close the Advanced sheet. Unlock the preference pane, if necessary, by clicking the lock icon in the lower left corner and entering your password. Open the DNS tab again and change the server addresses to the following:
8.8.8.8
8.8.4.4
That's Google DNS. Click OK, then Apply.
In Safari, select
Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. If you’re using another browser, empty the cache. Test. Any difference?
Notes:
1. If you lose Internet access after making the above change to your network settings, delete the Google servers in the Network preference pane, then select the TCP/IP tab and click Renew DHCP Lease. That should restore the original DNS settings; otherwise restore them yourself.
2. I’m not advocating Google or anything else as a DNS provider; the server addresses are offerred merely for testing purposes. There may be privacy and technical issues involved in using that service, which you should investigate personally before you decide whether to keep the settings. Other public DNS services exist.

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