How to select ALL photos in iCloud PC version?

I finally had enough of the warning "Your iCloud Storage is full" and decided to turn iCloud storage off but the system tells me an X amount of photos will be removed if I proceed - while attempting to do so on my iPhone, so I decided to download all of them in my pc just in case my other photo app didn't back up all of them... but the issue is selecting the photos one by one!!?!? Is there a (fair) way to download all photos and then delete all of them from iCloud? Oh, I am using a Windows 10, Chrome browser, iPhone 8 Plus 256GB and iPad Air 2, all up to date!