Update: Same problem was posted on Joomla support, and they seem to feel it is an extension bug.

http://forum.joomla.org/index.php?topic=...64.new;topicseen#new

Problem 1:
When installing Artio Joom SEF component, installer is unable to complete clean install as it does in legacy versions of Joomla. The following errors occur:

Warning: rename(/var/www/website/administrator/components/com_sef/bots/joomsef_metabot.php,/var/www/website/mambots/system/joomsef_metabot.php) [function.rename]: Permission denied in /var/www/jungleroots/administrator/components/com_sef/install.sef.php on line 32

Warning: rename(/var/www/website/administrator/components/com_sef/bots/joomsef_metabot.xml.tmp,/var/www/website/mambots/system/joomsef_metabot.xml) [function.rename]: Permission denied in /var/www/jungleroots/administrator/components/com_sef/install.sef.php on line 33

I resolved the issue by doing the file move/copies myself. The target directories did not exist. I'm not sure why this code would work on legacy and not Joomla 1.5 Rc2. I do have the legacy plugin installed.


Problem 2:
After installing Artio the Joom SEF component, retrieving the component administration module yields the following errors:

Warning: require_once(/var/www/jungleroots/administrator/components/com_installer/admin.installer.html.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/jungleroots/administrator/components/com_sef/installer/sefext.php on line 1

Fatal error: require_once() [function.require]: Failed opening required '/var/www/jungleroots/administrator/components/com_installer/admin.installer.html.php' (include_path='.:') in /var/www/jungleroots/administrator/components/com_sef/installer/sefext.php on line 1

It appears the administration module for JoomSEF relies on the com_installer file (joomla code?) admin.installer.html.php which no longer exists in 1.5 RC2? I have no workaround.