When I try to update I get a message that says "an error has occurred" and I cannot update like I have been doing for several years

When I attempt to upgrade I am now getting a message that says "an error has occurred" and I cannot activate the upgrades----there are two pending

Disable anti virus software if installed
Make sure the firewall is turned off in System Preferences > Security & Privacy > Firewall
Make sure Gatekeeper is enabled
Open System Preferences > Security & Privacy then select the General tab.
Make sure either Mac App Store or Mac App Store and identified developers is selected.
If that area is grayed out, click the padlock icon to proceed.
OS X: About Gatekeeper

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