How to download photos from iCloud (iPhone 4)
1. I don't know what iOS 7 looks like but you can try sharing the iCloud link with yourself as they are already backed up in the iCloud.


2. Other option can be to save all the photos to iCloud Drive(this is different from the photos thing) (if it is there). 

3. One can save them to notes and then wait for it to sync and then download it.

4. See if google photos or drive or Microsoft drive etc can store them.

5.  Firefox send is a good feature and is private too! If the above option makes you think that this is an app, you're wrong, it is a web tool. Go to send.firefox.com 

6. This is a new thing I came across recently. Go to Privacy-apple and download all the data. It might take a few in preparing the folder.

I did not remove the options that won't work for you for future readers.

Cheers!