Here's how you can download the My Purchases app free for Android devices. My Purchases lets you see all of your Android app purchases.
1. Go to the Google Play page for the free app My Purchases.
2. Tap the Install button.
Here's a description of My Purchases:
"Hands up, who misses the old overview the Google Play Store provided where you could see all your purchased apps in an instant? Sadly Google omitted this overview in the current versions of its store in favor of an overview which also lists all free apps.
This app bridges the gap and provides the missing overview over your purchased apps, books, music and even devices*."