NTA is not a standalone application. It still requires NPM to be there.
Keep in mind this is a Release Candidate, so everything is subject to change until General Availability:
The Falcon (online) installer only supports local NTA install (which is not recommended/best practice). You will want to continue to use the "Orion Netflow Traffic Analyzer (NTA) for Offline Installation" installer if you are working with the three server setup (Orion server, NTA Database, Orion SQL Database).
Actually it turns out that it was the installer. I was given the correct one from support and it works as intended.
They will correct the RC link for others.
RC installers are not betas. RC installers should and do act like GA. Companies like SolarWinds just want that little bit more testing in the wild before they go GA that's all.