Basically, what you need to do is:
1 - Before jumping to the standard procedures from a upgrade, we suggest the users to [check the plugin compatibility with the next versions|https://confluence.atlassian.com/display/UPM/Checking+Add-on+Compatibility+with+Application+Updates] to avoid further issues. Having that in mind, we can start the upgrade process by following the standard procedures:
2 - Extract the zip/tar.gz file of the latest version of Confluence on the place you choose. ( I highly suggest that you create a folder call: Confluence 'new version') and inside of this folder extract the install folder.
3 - Into the extracted folder, open the file confluence-init.properties, which is located at Confluence install directory\confluence\web-inf\classes and edit the line: confluence.home=/usr/local/confluence/home to point to the path where is your old home folder of your *Confluence current version*.
4 - Now start Confluence through your new installation folder
P.S1: Also bear in mind that content like external plugins installed would need to be re-installed, since this information is stored inside the database and other related content could be need to first be tracked inside the DB too.
P.S2: Always have a backup from your database and Confluence home before upgrade and try this first into a staging environment.
Also, have a look into this documentation:
Hope it helps.
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