You can stream the movie Conclave on Amazon Prime Video if you have a Prime membership, where it is available to watch for free with ads or included in the subscription

. Additionally, Conclave can be rented or purchased on platforms such as Apple TV, Amazon Video, Fandango At Home, Microsoft Store, and Google Play Movies

. There is also an option to stream Conclave on Peacock, but this may require a subscription and could include ads depending on the plan

. In summary, the primary and most straightforward streaming option is Amazon Prime Video for Prime members, with rental and purchase options available on multiple digital stores.