@JRavens
First off, thank you for creating those toolkits, they're super useful and I feel they should be baseline parts of gamemaster mode!
Especially some of the new statuses in the Toolkit II I've found to be extremely useful. It allows me to make trader npcs invincible and root them into place without placing visual effects on them, which can be super useful to prevent players from accidently moving or even killing them, while also not making each npc into a big glowing sphere. :P
Haven't personally used Toolkit I yet, because as you said there might have been some issues with it, so I held off for now.
Anyway back to the topic at hand. In my testing your mod did work when it was pre-installed on two different clients/pcs. Only when it isn't pre-installed any client joining into the game lobby will be automatically thrown back to the main menu with the missing dependencies message. Once the client then manually installs the mod before joining, it will allow them to join successfully.
When I checked the mod menu of the client inbetween it also downloaded and installed the first two mods, but then got thrown out when trying to download the Toolkit II.