The first rule, don't ever update Magento through connect manager, even worse on the production environment.
The reason why it's not working can probably be found in your error logs.
So, check following logs:
- var/log/exception.log
- var/log/system.log
- apache/nginx error log
- php-fpm error log (if you're using php-fpm)
It must be in some of those. Let me know about your findings.
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