Click on the album you wish to view and when you find a photo you want to download, right-click and select "save image as."
Click on the album you want to view and when you find a photo you want to download, click the 3 dots in the top right corner and click "download."
Press "control" and click. Then click "Save Image As..."
For Mobile Devices:
Click on the album you want to view and when you find a photo you want to download, click the 3 dots in the top right corner and click "download." From there, the photo will load into the browser, so press down on the photo and select "save image."