Download help

Depends on exactly what you are trying to do. If you have iCloud turned on for Photos, that should happen automatically. You might want to post a little more detail as to what you are trying to accomplish.

“...no storage on iTunes” I’m not sure exactly what you mean by that.

If you want to move i ages out of Photos, log into www.icloud.com on your computer and download them from there, then delete them.