Have you tried the website of your PBS affiliate? If you search Death Comes to Pemberley full episode 1, that might work. Here is a link I was able to pull: [www.pbs.org]
If the free link does not work, it's available for sale, of course, on Amazon. $1.99 SD, $2.99 HD.
If the free link does not work, it's available for sale, of course, on Amazon. $1.99 SD, $2.99 HD.