You'll need to activate the mod in the game after downloading.
There is a "mod manager" ingame, sitting in the lower right corner of the main menu screen. Click on the small cross thrte to access it.
Find the mod in the list, click the checkbox, game will prompt a restart.

Here's where to find the mod menu

https://i.imgur.com/Im7UAIr.png

引用自 Pilzquadrat：

Here's where to find the mod menu

https://i.imgur.com/Im7UAIr.png

I already did that, still nothing tho

Got discord so maybe we can call?

The same seems to be happening to me. Were you able to fix it?

In his case, he merely forgot he had to create a new squad after activating the mod.