title: An error occurred while preparing the installation. Try running this application again
body: <p>I am attempting to upgrade my mid 2011 iMac to High Sierra from Sierra and I get the error above.  I have tried changing the time per the instructions that are all over the internet for this issue but it does not resolve the issue. I do notice that after I attempt the upgrade after applying the fix that the time reverts back.  It does show PDT and I am Eastern time Zone. Not sure if that is why it reverts back.</p>