upgrade to 4.0.7
 

Did the upgrade to 4..0.7 without a hitch :-)

I forget where I read, but was told to delete up files with upgrade*.php in the folder /forum/install from the server

is it alright to delete the following files as well ?

upgrade_language.php
upgradecore.php
upgrademain.php

You may actually delete the whole install directory. You would only need it if you were told to add a file to the install directory and 'run' something since the assumption would be that the other files in the install directory would be used in the script.

thanks for the info