iOS
After installation if this is your first time installing a Liftoff app, click here. Install the provisioning profile by clicking on "Liftoff Mobile, Inc." then "Trust Liftoff Mobile, Inc." (Settings > Device Management > Liftoff Mobile, Inc.). This only needs to be done once, then all Liftoff apps will be trusted.
Android
Open Settings > Security, and under "Device administration," turn on the "Unknown sources" option. This will allow you to install apps from outside the app store.
Click here (on your device) to download the app. Install
SKAdNetwork
For testing SKAdNetwork attribution, install Greyhound app.
As mentioned in Bloodhound section, install provisioning profile when using a Liftoff app for the first time.