Hi there! I'm really sorry to hear that you're having trouble downloading the Dunkin' app. It sounds frustrating, especially since it was working fine just a week ago. Let's try to figure it out together.

First, could you let me know if your device has had any software updates recently? Sometimes, if the operating system hasn't been updated, it can cause compatibility issues with apps.

Additionally, could you provide me with the specific model of your phone? This can help in determining if there's an issue with your device's compatibility with the latest version of the Dunkin' app.

In the meantime, here are a couple of quick steps to try:

1. Check Storage Space: Make sure you have enough storage space available on your phone to download new apps. You might want to delete unnecessary files or apps to free up some space if it’s low.

2. Clear Cache: You can try clearing the Google Play Store cache. Here’s how:
- Go to Settings → Apps (or Applications).
- Find and select Google Play Store.
- Tap on Storage, then click on Clear Cache.

3. Reboot Your Phone: Sometimes a simple reboot can fix compatibility issues.

Let me know how that goes, and if the issue persists, we can look into more advanced troubleshooting options!