Upgrading and determining current version

It's used in CI 1.7, CI 2 and CI 3. I don't have access to any older version I'm afraid.
Can you post the contents of your index.php here? In case it dosen't contain any sensitive content.

Are you sure you are using Codeigniter? :-)

I am sure I'm at least using some of Coeigniter because all their function work.  It may have been heavenly modified before I got it.  

I can't find much to post that doesn't have any sensitive information in it unfortunately.

I may install a fresh older version on another server and try to work my way through there.  

Thanks for the help.