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I have completed the first steps by backing up my database, .htaccess and conf/config.php files.
I have downloaded version 2.3 to my computer.
I take it that should just 'Upload the new release's files so they overwrite the old ones' into my current forum folder in my public_html folder?
Does 'Delete all files in /cache' refer to the old cache in my forum folder or the cache in the new upload?
Unsure about: Go to yourforum.com/utility/update to run any database updates needed. (404? See next paragraph.) If it fails, try it a second times by refreshing the page.
Where do I find yourfourm.com/utility/update?
Apologies for so many questions but i inherited this old forum and don't have any experience in the backend of it.