Downloading from iCloud Photos: Zipped folder cannot be opened
I get the error message "Error 79: inappropriate file type or format" when I try to open the zipped folder that iCloud Photos created when downloading to my Mac (iOS 12.2). It's a large zipped folder (4.6GB) containing 999 videos, but I have plenty of disk space to expand it into (>120GB).
Any ideas on how I can unpack this allegedly inappropriate folder?
MacBook Pro 15″, OS X 10.10