This is the special U7 trial version that was hosted but seems to be replaced now with another older version.
After you have installed the trial you will have a message pop up saying that this trial will expire in Feb 2009 and the DBP logo watermark will come up on when you compile as well as a pop up when it first loads. To get rid of all these restrictions all you have to do is delete the three green darkbasic icon files found in the Compiler directory
"C\Dark Basic Professional Demo\Compiler"
Done, Cracked and ready.
If you already have the U7 trial you don't need to download this.