I have not downloaded these myself as they are not things that I'm personally interested in. So, I don't know for sure that everything works as advertised.
You might have to set up an account with Big Finish in order to download these. I just don't know.
Doctor Who--Vampire of the Mind.
https://www.bigfinish.com/offers/v/vampirenewsletter. Access code: 2masters
Cyberman Scorpius: Series One.
https://www.bigfinish.com/offers/v/scorpiusfree. Access code: planet14