I cant download my i cloud photos

Here is a good possibility for what your problem is.

See If you can't connect to the App Store, iTunes Store, or other Apple services https://support.apple.com/en-us/HT201400. There have been quite a few Apple server connection problems lately. Among other things, in the above document, see Check Apple’s System Status page. You can check there to see if the needed server is available when you need to use one.

Also, below are the alert messages given in the document. But, receiving others is a possibility.

Use the steps above if you see one of these error messages:

·      "Cannot connect to the iTunes Store. An unknown error has occurred."

·      "We could not complete your iTunes Store request. The iTunes Store is temporarily unavailable. Please try again later."

·      "Could not connect to the iTunes Store. Make sure your network connection is active and try again."

·      "We could not complete your iTunes Store request. The network connection could not be established. There was an error in the iTunes Store. Please try again later."

What is the error message(s)?