You have a windows server with plesk 8.3 and are looking to upgrade it to plesk 8.4 , to do this first download the installer from here on your server.

Then install it and follow the steps, this may take time depending on number of domains present on the server. Once finished you are requested to reboot the server and then try access plesk with port 8443 and you will see that you have plesk 8.4 login screen.

This worked perfectly for us, try at your own risk

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