Hi,
I have the exact, same problem, for the free version of Wordfence. I tried changing the permission from 644 to 755 for my tmp/configCache.php as the error message suggested: (The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions tmp/configCache.php)
but that didn’t work.
My entire site disappeared last night too. I imagine it was a related issue. Today I got it back by deactivating, then re-activating each plugin one by one (including Wordfence). Everything seems to be running smoothly again, but, still, I cannot update wordfence.
I hope this clear? Any advice would be appreciated.
thank you