If 1803 absolutely won't install, I'd go through the troop in reverse starting with 1709.
I edited an earlier post to say 1507 should show Backup & Restore in Control Panel, if it isn't in Settings. I saw your edit of a prior post, but we aren't notified of edit's, just the original post.
So, usually it's best only to edit a post that hasn't been answered yet - as I've just edited this one.