You can install the free version of the product to test some of its functionality, but if you want the full version, then you have to acquire a serial number to unlock it. This software isn't free, it requires payment to unlock all available features and options. If it installs as a trial, then it's possible that the trial expired, and now it requires registration.
Remove the software and then download the new package from the official website of the developer: https://123copydvd.com/products/