This older version hasn't been released on DVD but you can watch the entire film split into parts on youtube. Be sure to hit the "HQ" high quality button on the youtube browser.
My mother and I used to enjoy watching the 1949 movie The Secret Garden, featuring one of her favorites, Margaret O'Brien, when it happened to come on television. It's a beautifully dark picture along the lines of another 1940s movie that starred O'Brien, Jane Eyre. I still like its gothic spookiness and also how it celebrates the natural interest that, given the opportunity, children have in nature. Well, at least I hope they still have that interest...test yours and see.