when will the v3 of this componant be out as i cant upgrade my site till i have the seo on native :( server load probs

Hi im using
Php 5
Apache 2.2 server
Cent Os 5
Mysql 5
ARTIO JoomSEF v3.1.2

the default install on v3 does not have the mosets tree plugin, i serached the dl section and found the mosets tere plugin as ext_joomsef_mtree-1.1.1.zip i donwnloaded and installed via the admin panel which said SEF Extension Install: Success, now when i go to a mosets tree listing i get the following error
Fatal error: Class 'sef_404' not found in /home/beta/public_html/components/com_sef/sef_ext/com_mtree.php on line 15

anyone know how to fix this

hi i just downloaded the free version for testing for joomla 1.5 it seems it does not have the mosets tree plugin and its not in the shop either to buy i was wondering what happend to it as it says its free in the plugin lists. is it missing or just not supported i really need mosets tree if u could sort it i would love it.
Thanks
Suley
p.s whats the diffrenace between free and paid i take it free adds ads in the meta tag and a powred by is it?
if i buy the paid for 6 months after 6 months does updgrade stop?