Ah – ok. It was just that you said the error was “Can´t create database “chatted” – but I guess that was auto-correct. Maybe the catdv database already exists? If you delete it and then re-run the script that should work. Otherwise I guess there could be some permissions issue, or possibly the disk is full. We’d need to see the full error log to work that out.
Generally speaking the latest desktop client is supported with the latest and the one previous major versions of the server(so currently 7.0 and 6.10). However, that is different from saying it won’t work on older versions of the server. You can always download a trial of the latest version and see how you get on.