To download all of your matched photos in the Waldo app, follow these steps:
1. Open the Waldo Photos app and tap the gallery you'd like to download from
2. Navigate to your Matches
3. Tap the three dot icon in the upper right corner, then tap Download and Select All
4. Tap Save and you will be asked for permission for Waldo to save photos to your device
5. Tap OK and all photos will be downloaded to your camera roll
Please note that when viewing you matches on a computer, you can only download them one at a time and not all at once like in the Waldo app.