Youtube has it available in multiple parts, which should autoplay from here:
1000 Misspent Hours likes it, saying, "So far as I’ve seen, nobody but RKO was making horror movies as serious and mature as The Uninvited as a matter of course during the 1940’s, and to watch The Uninvited is to wonder why the hell not." Moria describes it as "Hollywood’s first serious attempt to conduct a ghost story." The New York Times warns:
Proceed at your own risk, we warn you, if you are at all afraid of the dark. For this fiction about two young people who buy an old seaside house in England, only to discover that a couple of banshees have taken up residence first, is as solemnly intent on raising gooseflesh as any ghost-story weirdly told to a group of shivering youngsters around a campfire on a dark and windy night.
MSN and TCM have overviews.