downloadable at Internet Archive
"Happy Go Lovely" is available to download in full quality DVD resolution from the Internet Archive. Other lower quality versions are also available.
http://www.archive.org/movies/details-db.php?collection=feature_films&collectionid=happy_go_lovely
The Internet Archive is great, their Feature Film section has over 350 public domain movies.
http://www.archive.org/movies/collection.php?collection=feature_films