XF 2.2 How to upgrade XenForo

During upgrading, I received the following error, I tried manually and from admin > tools

Fatal error: Illegal length modifier specified 'f' in s[np]printf call in /home/domain/public_html/src/vendor/league/flysystem/src/Adapter/Local.php on line 199

How to resolve it? I do have DB back up, but did not back up files/folders.

The main forum website and admin site is " currently being upgraded. Please check back later." mode. I can't do anything.
We've seen this a few times now. We're not sure what exactly causes it but a few times upgrading or downgrading PHP has solved it. If you can switch your PHP version easily, I'd definitely try that first.
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