To download and install the new Generative Fill feature in your Photoshop application, you will need to install the Photoshop Beta.

To install the Photoshop Beta, follow these steps:

1. Open the Creative Cloud Desktop app.
2. Click on the Apps tab.
3. Scroll down to the Photoshop Beta section and click on the Install button.

Once the Photoshop Beta is installed, you can enable the Generative Fill feature by following these steps:

1. Open Photoshop.
2. Go to Edit > Preferences > Technology Previews.
3. Under Generative Fill, select the Enabled checkbox.
4. Click on the OK button.