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You can check: https://www.justwatch.com/de/Film/Das-Leben-der-Anderen

Seems to be available in Germany and some other countries, but not here in Sweden at the moment (I think it used to be on Netflix here).

It is available from Amazon.de on blu-ray (probably also on Prime Video depending on the country), under the original German title: Das Leben der Anderen.

You can find it on bittorrent: https://bt4g.org. That's a DHT search engine. Put in your query and sort by seeder count, then use the magnet link to load it onto a bittorrent client (e.g. qbittorrent).