Right-click the image and select "Save Image As..." . You can then choose your destination folder and ensure the file name ends in .jpg or .jpeg .
Visit iCloud Photos, click the upload icon (cloud with an up arrow), and select the files from your computer. Download upload jpg
Downloading involves saving an image from the web or a cloud service to your local storage. Right-click the image and select "Save Image As
Go to iCloud Photos , select your images, and click the download icon . select your images