Update Concrete5

From the dashboard, Systems & Settings, Backup & Restore, Update concrete5 when I click on Update Concrete5 I get:
HTTP 500 error
That’s odd... the website can’t display this page
The site may be under maintenance or could have a programming error.
Try this
Go back to the last page
Try contacting the website’s owner

I am currently using:
# concrete5 Version
Core Version -
Version Installed -
Database Version - 20160615000000

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