tried to upgrade to el capitan of lion but I get this message: INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE

I have an IMAC mid-2010 and tried to upgrade to el capitan of lion [software Mac OS X Lion 10.7.5 (11G63b)] but I get this message: INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE

How to solve this.  I think that's what keeps me to sync my iPhone 6 and IPAD PRO I got the year last, and 1 month ago, respectively, with the iMac. I tried to download iTunes separately, but it does not work. Memory is 1 t, processor 3.2 GHz Intel Core i3. Memory DDR3 at 1333 MHz 12 GB

Make sure your time and date is correct.  If this is not the case, correct it and try the install again.

Remove anti-virus, anti-malware or module security or performance or system cleanup tools according to the instructions of the respective providers.   Try again.

If this fails, restart the iMac by Safe Mode like which clears and regenerates the system puts in cache, among other details, reboot normally and see if the Mac App Store download starts working.   Then re-download the installer of El Capitan, and then try again.

If all else fails, please after the release of Etrecheck as a starting point - which will indicate the specific hardware configuration nd can show if there is something wonky openly what is installed.

Tags: Mac OS & System Software

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