Splice Bridge is currently in private beta with a limited set of Splice subscribers. If you are in the beta, check the email associated with your Splice account for instructions.
If you are in the beta group, open the latest version of the Splice Desktop App. You may have to quit and restart the app to auto-update to the latest version.
Then, play any sample and follow the installation instructions.
You can also install Splice Bridge from the Tools tab in your Desktop App.