There are at least 1 file(s) that do not appear to have the expected contents. Reupload the XenForo files and refresh this page. Only continue if you are sure all files have been uploaded properly.
That's a different issue.
Download and upload the files again.
If it continues, use a different FTP program. I recommend WinSCP.
Sounds like you are trying to do an installation.
How are you upgrading, exactly?
Did you download the upgrade .zip package, upload the contents to the server and then navigate to /install?
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