The file you mentioned – "Saints Row IV- Re-Elected Switch NSP -UPDATE- -..." – likely contains the update file only. You will still need the base game NSP separately.
Saints Row IV: Re-Elected on Switch had a few rough edges at launch, specifically regarding audio syncing in cutscenes and occasional texture pop-in. Nintendo subsequently released a patch (often version 1.0.1 or later depending on the region) that smoothed out these issues. Saints Row IV- Re-Elected Switch NSP -UPDATE- -...