Hi Dreamscape,
Had this :
Fatal error: Class coreadvancedsearchresultseourlplugin: Cannot inherit from undefined class coreadvancedsearchseourlplugin in /home/sites/domain.co.uk/public_html/includes/classes/seo/seo.url_plugins/__core__/advanced_search_result.php on line 14

Tried to reach your fix as above, but could not reach it, it said a log in is required. Could I have a copy of the fix please?
Having the same problem referred to in this post. I tried to access the fix at the mentioned site. I created a new account, however I have yet to receive the verification e-mail. It's been several hours, is the fix located anywhere else?