There appears to be two different links to GenieACS documentation.
Both of them link from the home page:
link (1) can be found at the top of the page where the text “DOCS” is located
link (2) can be found under the text “DIY” right under the “Get Commercial Support” button
Following them also leads to two different versions of the documentation for the API.
I would imagine the docs that mention using node 10, and NPM to install it are probably the latest or suggested documentation, but someone may want to look into this to ensure you’re sending users to just one correct set of documentation, to avoid confusion.