If you open the drop-down cab menu in torpedo remote. You should see icons next to each one. This icon indicates if this cab stored on your Sono, stored on your computer or if it is a cabinet available for demo from the two notes store.
A cabinet with a small pedal looking icon is one that is stored on Sono itself and means that this cabinet can be used in preset's and will load quickly if selected. Information on how to load cabinets onto Sono can be found here.
Similarly, a cabinet with a computer icon next to it is one that is licenced to your two notes account is and is then automatically downloaded onto your computer. This would include the 20 cabinets which are included with Sono as well as any cabinets purchased from the Two Notes Store.
Finally, a cabinet with a cloud symbol next to it would indicate that this cabinet is one that isn't currently licensed to your account but can be used in demo mode. When one of these cabinets is selected, the cab is downloaded temporally for you to use on your Sono. A short silence will be added at random to your audio whilst in demo mode. If you like what you hear then the cab can be purchased by clicking the cart button to the right of the cab.
This will open up your default browser and launch the Two notes store so you can complete the transaction.
You can filter these three cab options using the buttons just above the Cabinet drop-down menu to make it easier to find cabinets.