Nero no longer issues new 15-day trial keys for version 9. Instead, they offer a for their modern Nero Platinum Suite through the Nero Start application.
If you previously purchased Nero 9 and just need to reactivate a trial installation, you can find your key in a few places: Serial Number For Nero 9 Trial
Navigate to: HKEY_LOCAL_MACHINE -> SOFTWARE -> NERO -> SHARED -> NL9 . Look for the string in the right-hand pane. Nero no longer issues new 15-day trial keys for version 9
Finding a serial number for a 20-year-old trial version like Nero 9 can be tricky, especially since the official trial is typically built into the installer or provided via an email that has long since expired for most users. Serial Number For Nero 9 Trial