It fetches the pinned version from nodejs.org, verifies it against the published SHASUMS256.txt, and copies into /usr/local: no package manager is run, no repository is added, and no remote script is piped into a shell. If the download cannot be verified, nothing is unpacked and the refusal says so.
Full technical release notes for 7.1.3 are on the changelog, alongside every other Ghost Architect™ Local release.
Ghost Architect™ Local runs on your own hardware.
If you want an evaluation trial, the download page tells you how to get the tarball, verify it, and start the evaluation trial on your own hardware.
Request Ghost Architect™ LocalEJ Wisner, founder of Ghost Architect™. Local pricing is monthly, per team size, with no per-token bill; the numbers are on the pricing page.