Why in: http://codologic.com/page/user/ download area it says that it expires in 6 months?

Second question: Is there a file I can call so that I can just bring up the chat box on the bottom right without my actual websites pages?

1. it means you cannot download newer versions and have access to support via tickets after 6 months.

2. no, you will have to create a blank page and load the chat into it.

But the branding and powered by will remain removed, surely ?

Thanks for the update, and a suggestion for your chat mod would to create a popout.php file, so people can access it directly and so we could drag it anywhere on screen.

But the branding and powered by will remain removed, surely ?
Yes, they won't come back.

thanks for the suggestion, we will think about it.