So there is a "First Launch" metric, which is essentially an "install" (which is part of the lifecycle metrics)... (along with Launches, Upgrades, etc)
Now, you have to keep in mind that data will only send when the app is open...
So
Scenario 1:
- User Downloads the App
- User never opens the app
Scenario 2:
- User Downloads the App
- User opens the app right away
- Lifecycle Metrics (if enabled) should send:
- Launch Event
- First Launch Event
- User uses the app a month later
- Lifecycle Metrics (if enabled) should send:
- User Updates the App a month later
- Lifecycle Metrics (if enabled) should send:
- Launch Event
- Upgrade Event
Scenario 3:
- User Downloads the App
- User opens the app for the first time a month later
- Lifecycle Metrics (if enabled) should send:
- Launch Event
- First Launch Event
This should track only 2 "First Launches"/"Installs", since scenario 1 never opened the app...
In scenario 3, the "install" (aka First Launch) is actually delayed by a month, since the app wasn't opened.
In scenario 2, I show an install, a launch and an upgrade... so your "Launches" for that user would be three over the 2 months, there would be 1 install (First Launch), and 1 Upgrade.