Putting a new sky into your image is easy if you have Aurora HDR.
After creating a basic HDR image, go to the Layers menu and add a new image layer. Choose an image with a sky from your desktop. This new image will sit on top of the base layer, covering it completely with 100% opacity.
Then click on the Brush, choose Gradient Mask, and apply a mask to the area where the new sky should appear. Finish adjusting the sky with the Transform tool and go on fine-tuning the image if needed.
It’s as easy as one-two-three!