I click on demo and a page comes up and says the demo version has expired. I just downloaded it like an hour ago.
When Nero put up free trail offers, they are fully functional but will stop working after certain dates (as per-determined by Nero). So after the experiation date the software will not work and the only ways to get around them are either buy the darn thing or wait for them to put up another trail offer. Check their website for such.
The trial version is good for 30 days. You must have gotten an older trial version. Try to download a new trial version.