[RSS Feed/News] The following issue was found when determining if a one-click upgrade is possible: The files are not writable

[XenForo]

So I'm thinking about upgrading (though I plan to build a test installation first) to the new 2.2.7 But I got the error as in the title "The following issue was found when determining if a one-click upgrade is possible: The files are not writable."

My question is, which files are folders need to be writable and to which permissions?

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