Because the game relies on the proprietary sensors inside these peripherals, Even if you manage to find and install a "gratis" NSP file on a modded console, you will be stuck at the opening screen because the game requires a connection to the Ring-Con to proceed. The Risks of NSP Downloads

You don't risk damaging your console’s firmware or getting banned from online play.

Many sites offering "free downloads" bundle files with malicious code that can brick your Nintendo Switch or steal personal data if you use your console online.

While it’s tempting to search for a "Ring Fit Adventure Switch NSP Download gratis," there are several critical reasons why this isn't just risky, but often impossible to get working as you’d expect. The Hardware Reality

If you are looking for digital downloads (NSP files) from unofficial sources, you should be aware of the major drawbacks: