Open a web browser and go to iCloud.com
Sign in with your Apple ID
Click Photos
Select the photos you want to download
Click the Download button
Choose Download Unmodified Originals if prompted
Save the files to your computer
On iPhone or iPad, open the Photos app
Select the photos you want
Tap the Share button
Tap Save to Files or AirDrop them to another device
On Mac, open the Photos app
Select the photos you want
Drag them to a folder on your Mac
Or choose File and then Export
On Windows, install iCloud for Windows
Sign in with your Apple ID
Turn on Photos
Open File Explorer
Go to iCloud Photos
Copy the photos to your computer
To download all photos at once, use iCloud.com on a computer
Select all photos
Click Download
Wait for the ZIP file to finish downloading