Hi, I just installed Joomla 1.5.9 on a php 4.4.7 server. I also installed Mosets Tree 2.0 and Artio SEF + the paid version of the Artio Sef Extension for mosets. However, each time I try to upload Artio SEF extension for mosets I get the following error
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Warning: setadapter(/home/XXXXXXXXX/public_html/libraries/joomla/installer/adapters/sef_ext.php) [function.setadapter]: failed to open stream: No such file or directory in /home/XXXXXXXXX/public_html/libraries/joomla/installer/installer.php on line 216

Fatal error: setadapter() [function.require]: Failed opening required '/home/XXXXXXXXX/public_html/libraries/joomla/installer/adapters/sef_ext.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/XXXXXXXXX/public_html/libraries/joomla/installer/installer.php on line 216
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Any help would be greatly appreciated

(p.s. I replaced the site name with XXXXXXXXX above for security reasons)

Just a question ... are you installing the extension using the Installer build-it JoomSEF? (not the Joomla default installer)