On the web, you should be able to find and access your purchased videos here: 

MHz Choice Video Purchases 

On Mobile apps : 

1. Open your app
2. If you haven’t yet, log in
3. Navigate to your Library on the bottom of the page
4. Your purchases should be under the “purchases” tab

On TV apps : 

1. Open your app
2. If you haven’t yet, log in
3. Scroll down to "Library"
4. Your purchases should be under your My List row.