Does this change your answer or does it remains the same?

Thanks!

Basicly it doesn't. In downhill shooting the easiest approach would be to divide wind into 3 components. Parallel to bullet path (aka. range wind), side component (crosswind) and vertical component. Then you can separately calculate all these components. Most ballistic calculators are capable of calculating range wind and cross wind and there you have it.

For example if your downhill shooting angle is 30 deg and you are shooting directly against 10 m/s wind:

Range wind component is cos(30) * 10 m/s = 8,7 m/s

Vertical component is sin(30) * 10 m/s = 5,0 m/s

To be exact bullet path curves along the trajectory so this 30 deg angle is not exactly constant but it is close enough remembering that in practice wind velocity is always only an estimate.

And then of course there would be a sideway aerodynamic jump due to vertical wind when bullet aligns against incoming air flow. If vertical wind comes from upwards then aerodynamic jump drifts left (right hand twist).

This down/uphill shooting is actually something I could include my ballistics calculator. I haven't thought about it since it's so flat where I live.