Some developers are seriously considering de-listing their games from online shops when the Unity Runtime Fee kicks off at the start of next year, meaning some titles built on Unity could end up being temporarily — or permanently — unavailable. Here's what developers are saying about the Unity Runtime Fee on social media, and what games could be impacted.
Unity Revenue reporting has always been “self-reported” by users. If they think you’re lying and aren’t on the right license they send the complkance team to make sure you’re giving enough. Unity has no way of knowing installs because as you said it doesn’t connect to Unity.
You don’t download anything separately, the runtime is included with the game.
The runtime could be updated with a phone home feature to track the install