Questions and Answers are listed below....
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Are you upgrading TO or FROM ver. 5.4.9? Can you confirm?
My apologies, I meant to say upgrade to v5.5.2.
Available Updates
A new Nagios XI update is available.
5.5.2 was released on July 26th, 2018.
Visit
http://www.nagios.com to obtain the latest update.
Latest Available Version: 5.5.2
Installed Version: 5.4.9
Last Update Check: 08/06/2018 15:01:05
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If you are upgrading to ver. 5.4.9, what is the version of Nagios XI that you are upgrading from?
N/A
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If you are upgrading to ver. 5.4.9, post the /tmp/nagiosxi/upgrade.log file on the forum.
No such file found. The /tmp/nagios directory does not exist.
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Is your Nagios Xi server connected to the Internet? Are you using a proxy?
We are using a proxy. See a screen print of the Proxy config in Nagios
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Have you tried upgrading manually (from the command line)?
No. Didn't know we had that option as I thought we upgraded from the GUI.
We could try the command line option - will look at documentation link you sent - but we prefer the GUI method.