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You will then see the following on your screen. If this appears to hang (as it can sometimes with Confluence) then simply refresh the page and start again. If you are installing remotely then remember that it will take time to upload the install file first.
When the installation has completed you will see the below. Click on Close.
You have now installed the update. And will see something similar to the below. Confirm that the version number is correct and that all modules have been loaded.
YOU canro ll back to a previous version by installing it over the top of the version thatis currently installed.