Problem with ore spaen mod

I have a problem with the ore spawn mod on my server, I already downloaded it, and it does not generate a problem with the world or with the other mods. But it's like I never loaded it for some reason. I don't know if there is a way to activate it, I have downloaded the OreSpawn-1.12-3.3.1.179 version. Can anybody help me please??

Because there is not a problem starting the server, but it doesnt make any change to the game, there are 0 new cafts or mobs. It doesnt works, and I can't find a way to configurate it like other mods un settings.

I have watch some reviews before and I expect to get the mods modifications just in the generation. Thanks for your help