@yongedevil hasn't been around for a year and a half. I've provided an updated version for the ETT, but am doing it now as a full release, so that it can be in CKAN as well.
Original thread here: https://forum.kerbalspaceprogram.com/index.php?/topic/112886-104-yongetech-tech-trees-plugin-v13/
Source Code: https://github.com/linuxgurugamer/YTK_TechTrees
Download: https://spacedock.info/mod/1526/YongeTech: Tech Trees Plugin Re-Revived
License: MIT (see below)