If you click About RealCADD you will see this pane which is largely informational.

However you can click the links to go to the RealCADD web page and the RealCADD forum.

If you have the free trial version of RealCADD, you can upgrade to the full version using the links at the bottom of the pane.

To make the pane go away, simply click anywhere in it, other than one of the links.