Question [Resolved] Upgrading to 1.6.5 "not possible to delete xxx.php"

Thanks,
I've read everything that I could find inc installation guidelines and followed them to the letter.
I did not set up the site (I have been unable to get the developer to assist to date, hence the delay).
All revs tried inc 1.7.1. Un-install/Install/upgrade/fresh ... same error

I see Com_Kunena in both public_html/components/ and also in public_html/Admin/Components

ini.php is in public_html, not in Admin/components/Com_Kunena,
Copyright, changelog etc is in public_html/components/Com_Kunena - NOT in Admin/...
All files are green and writeable.

All permissions seem OK, so either they are mixed across public_html/Components/Com_Kunna and public_html/Admin/Components folder and there is some code that refers to relevant files located elsewhere that Kunena install require to be in a specific location.
or my own Super Admin is not super enough.

Manual removal of files reverts on refresh.
I shall go find the developer again and see if I can persuade him to divert his attention from more pressing requirements, but last call suggested that no reason why it shouldnt work.

Thanks.

All folder and file permissions in your Joomla folder (and recursively through your site) should be set the same (as recommended by Joomla) and your files should be owned by Apache:Apache. If you have mixed permissions, this may account for why you're having problems.

I was advised by PM that the matter has been resolved. The issue was resolved with the webhost provider; it involved incorrectly set file/folder ownership/permissions.