Welcome Jose,

First go to Max's archive http://moi.maxsm.net/nodeeditor/
& download latest version of nodeEditor "nodeeditor.v.1.0.rc3.2018.03.09.zip"

Then follow INSTALLATION instructions found here: http://moi3d.com/wiki/Nodeeditor

There are a couple of troubleshooting forum threads:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9172.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=8701.4

Only after you are familiar with the UI and core set of nodes
should you consider installing growing set of user mod nodes:
http://moi3d.com/forum/index.php?webtag=MOI&msg=9358.1

This step entails replacing original "nodeeditor" folder with one in unzipped download.
It is worth skimming through http://moi3d.com/forum/index.php?webtag=MOI&msg=7777.1
There are lots of .nod files attached to posts, but be aware that those in the first half of this long thread
will be out-of-date and will not run in latest version of NE.

Good luck with everything, & don't be afraid to ask questions here.
Hope this helps,
James
https://www.instagram.com/nodeology/