El Capitan update cannot be verified

Using a 27-inch iMac late 2009.  Processor 3.06 GHz, Intel Core 2 Du0 speed

4 GB 1067 MHz DDR3 memory

Running version 10.11.2

Problem: Cannot install last updated (10.11.3).  I get the message "Upgrade cannot be verified".

I tried to disable my virus program.

Any thoughts on what could happen?

Help appreciated.

This means that the download is corrupted somehow.

Try to download the update from here: download OS X El Capitan 10.11.3 updated

Tags: Mac OS & System Software

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