If you have a Knowledge Base that uses the Carmine Theme as the Default Style, you can migrate it following the steps described in Migration of KB with Carmine Theme to Unanimo Design System.
To install GeneXusUnanimo and start using it incrementally, go to Knowledge Manager > Manage Module References, select Global Matrix, and then select GeneXusUnanimo module. Lastly, click on Install.
See Modules Distribution in GeneXus to learn more about how to update modules.
In addition, you can use Unanimo Showcase to access different samples that show which class to use for every control that you can use in your Panels.