Help with installation: Download the .apk to your device and install it. You can always find the latest instructions here: https://www.humblebundle.com/app
Activate the app by logging in to your Humble Bundle Account. If you have not created an account (even if you have purchased in the past), please do so at https://www.humblebundle.com/signup. Open the Humble Bundle app on your device. Tap on "Log In" and enter in your email and password to your Humble Bundle account.