How to download entire iCloud Photo Libary to Windows PC
Apple doesn't have a Photos app for PC, so the easiest way would be to borrow a Mac and log in to a new user and download all the photos to the Mac.
At that point, you can export the entire library to storage that's readable by your PC.
If you only have easy access to an iOS device, then you'll want to look into apps that can ingest all the local versions of the library and upload it to their cloud. Flickr, google, dropbox all come to mind with native apps that want to store all your photos in the cloud. You could try those to see how easy their export from cloud to PC is.
The share sheet on iOS 9 and the Photos app on iOS look like they will save entire albums to DropBox, but you could run into storage issues and have to chunk things a few GB at a time.
If I were to do this, I'd probably use the Workflow app to automate the saving of the files to the location of your choice. It has built in save to iCloud Documents which would work with iCloud software on PC.
Lastly, you could try using iTunes to copy the files to your PC. I don't have a PC to test, but that might be the simplest option if it works.
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