This just seems to be the web app in weird packaging, and you would get very little benefit installing it.
Personally, I use an iPhone, and I just resort to the web app, and I can live with it. Not as fancy as on the Mac, but I manage. I’m able to access my Apple e-mails and photos just fine. I eventually just plan to jump the Apple ship, but like you, that’s not possible for me at the moment.
As others have said, rclone might work for you, but I personally don’t use iCloud Drive, so I don’t know enough to speak about it.
Yeh. I totally could compress this to crap, but I didn’t.