Did a bit of reading on the plugin formatting, and the reason the help info doesn't come up on the MZ plugin is some of the initial stuff is simply out of order. 

Putting it in this order fixes it

* @target MZ
* @plugindesc v1.3.8 A techtree plugin.
* @author Felski
* @help

The plugin commands obv won't work, but there is essential info in the help for how to setup the plugin. (I tried figuring out how to fix up the plugin commands, but I don't know enough about the plugin to mess around with that at the moment.)