Can’t install Nero Burning Rom 15.0.0.02700 trial version

I uninstalled the previous version, and deleted all Nero registry entries, but I still get the trial expired screen. What did I miss?
Answer #1
Once u used the trail version u can’t use it again there are only 3 option : first use trial of another version, second use a trial reset if available & third if u are going to format your PC u can install the trial version again
Answer #2
Best to install a version with a patch such as this…
http://www.google.com?t=16135222&highlight=&
Sometimes you can update parts of it OK afterwards..