A Window of Time To Define Users Who’ve Re-installed
Re-attribution happens when a new install is generated by a user who has uninstalled an app and comes back after viewing or clicking on a re-engagement campaign. But it cannot be counted as a new install if it happens inside a pre-defined period of time called a re-attribution window.
The window begins when the user downloads the app. Re-installs within the re-attribution window do not generate new install postbacks. Postbacks give credit to the ad network where a users clicked or viewed an ad before downloading.