The only place I know of where you might be able to download a lever harp version would be from Mary Jean Zarrick’s website, harpmusicnow.com. She has an easy version in her popular Christmas collection
However, it costs $32 to sign up there, so I’m not at all sure it would be worth it.
Of course there are several books with printed versions, but AFAIK none of them are also available as downloads. Check folkharp.com–maybe Mary R could express one of them to you in time.