I can't upgrade to 2.9.2. The error message I get is:
Could not copy file: /html/index.php
I thought it might be a permissions problem but I've just successfully upgraded to 2.9.2 on another website where the permissions are the same.
It shouldn't be a plugins problem either. The website I'm having problems with has only 3 plugins, all of which are also used by the site where I had no problems upgrading.
Would really appreciate any help.