The add-on needs the main Mod.
The add-on needs higher priority than the main mod.

Medium = Value of 15,000 (medium quantity)
High = Value of 40,000 (high amount)

If you want a lot of drops on the glass, you can use the "High", if you want something less, you can use the "Medium", if on the contrary you want a normal rain do not use any add-on