You can often find this film on the Internet Archive, typically uploaded by community users or as part of public domain collections. Here is what you generally need to know:
The Internet Archive (archive.org) is a non-profit digital library offering free public access to millions of books, software, music, and—crucially—films. Unlike commercial streaming services that rotate content due to licensing deals, the Internet Archive aims for permanence, hosting everything from public domain treasures to home movies. the+servant+1963+internet+archive