This app is one extra tile on your Home menu and there's no way to merge these games with the existing N64 releases, but it is what it is. On a more positive note, this does mean even more mature-themed Nintendo 64 titles could one day make their way across to the Expansion Pack service (come on, Conker's Bad Fur Day).
The "mature" application originally made its debut on the Switch in Japan last November, alongside the release of GoldenEye 007 and Jet Force Gemini. Noticeably these games managed to avoid being added to Nintendo's mature version of the app here in the West.
To download this second Switch Online N64 app, you'll need to head over to the Switch eShop, navigate to the NSO section and you'll see it sitting alongside the existing application. Of course, you'll also need to have access to the Expansion Pack subscription tier to play these games on your Switch.
What are your thoughts about how Nintendo is handling these "mature" releases, and having to download a second version of this app? What games would you like to see join this version of the N64 application in the future? Let us know in the comments.