how to add download button to safari toolbar?

I don't remember what this thread has advised, and there are 5 pages I could review, so I just have two things for you to check on.

1. Under Safari, Preferences, General, I have my "Remove Download list items: Manually"
   The Download button itself appears after you have downloaded something. On my Mac, it stays on my toolbar, I am thinking because I have items in there. If you clear the list from the button (when you click on it), it will have the button disappear.
2. If you want to shorten the list, you have to Remove individual items. Click on an item (carefully?) and choose to Remove From List - you may also choose to open, show in Finder, or copy address.
   It seems I have to keep at least one item on the list or the button disappears until I download something new.

I'm running Sierra 10.12.6 and Safari 10.1.2 (and 11.0.1 on another mac)

Hope this helps. Post back if it does or doesn't. That helps!