You request a "Copy of your Data," select iCloud Photos, and Apple prepares your entire library into downloadable ZIP chunks.
Once installed and signed in, it creates an "iCloud Photos" folder in your File Explorer. How To Icloud Photos To Windows Pc
For those looking to move a massive library (e.g., 50GB+) to a PC for permanent storage or to quit iCloud, the Apple Privacy Portal is the hidden "power user" move. You request a "Copy of your Data," select
If you just need a few specific albums or a handful of photos without installing software, the web interface at iCloud.com/photos is your best bet. " select iCloud Photos