If you want to try The Prince before buying it, you need to install Cradle Hub and sign in (get more in-depth instructions in Cradle Hub Setup). The trial will be ready to install in the Discover tab.
The trial and full paid versions of The Prince are functionally identical. All samples and presets and all controls are fully accessible in both versions. You can save and load user presets and DAW projects on both.
The only difference is that the trial version will stop working 5 days after being installed. The user interface will become inaccessible and The Prince will stop producing audio. You will need to buy a full copy if you want to keep using your presets and DAW projects.