This version is almost fully language abstracted, there's going to be odds and ends we've missed, but the vast majority should be complete now. There's also a lot of interface tweaks, including some big changes to the new ticket and and ticket reply forms. There's a few new features around as well, such as billing credits.
We recommend that you do a clean instuall, however, you can upgrade by overwriting all of your files with the downloads, except conf_global.php, then run these queries:
SQL
ALTER TABLE ticket_departments ADD ticket_dept_description TEXT NULL ;
ALTER TABLE cms_article_rss_import ADD article_rss_allow_html INT(1) NOT NULL default '0';
ALTER TABLE core_customer_data ADD billing_credits FLOAT NOT NULL DEFAULT '0';
ALTER TABLE cms_article_rss_import ADD article_rss_allow_html INT(1) NOT NULL default '0';
ALTER TABLE core_customer_data ADD billing_credits FLOAT NOT NULL DEFAULT '0';
After that, recache everything from the acp, and reimport language files. Beta 6 will have the real upgrade utility, so you won't need to do this for the actual release.
