Isometric view and throwing grenades

Hi, I sped over one day for looking solution.
I'm using click to move like game with isometric view.
I want to allow player to throw grenade.

Raycasting from typical FPS game won't work.
Grenade should fly from Player's position to position where is mouse on the screen.
I've got script which throw grenade from player up to him and it ignores the mouse position.
It should fly forward.
Can someone give me an issue for this?

 

I made a GitHub repository that does what I think you want (fire a projectile from point A to B).

https://github.com/IronWarrior/ProjectileShooting

 

Thx. I made it for my own, but Yours is very good too. I must revise my code. Much thanks, I owe You beer