Praise first!! It is a lovely bit of kit - thank you - works on other sites!!
However on a new site, just uploaded the Updater and its response is:

Warning: ftp_chmod() [function.ftp-chmod]: Could not change perms on /public_html/tmp/jupgrader.xml: No such file or directory in /home/hpunion/public_html/administrator/components/com_jupdateman/libraries/joomla/filesystem/helper.php on line 100
Update file does not exist: /home/hpunion/public_html/tmp/jupgrader.xml

Parsing XML Document Failed!

The permissions on the tmp folder are 777
The address of the tmp folder is correct
I can FTP to that folder happily with Cyberduck

Help!