Thank you for reaching out. I assume you are talking about Amazon SDK Tester, the helper app shipped with the SDK zip, we use it to test IAP in sandbox. Right?
If Yes, it should work on recent version of Android OS too. Can you please help us to understand the issue please?
1. Are you using the latest SDK tester? We have a SDK zip update couple of days back. Please make sure you have downloaded the latest zip.
2. Is it occurring in any other OS version? 4.2 or later?
3. What is the exact problem? When you click a button (e.g "Active Transaction"), do you see to open any page in default browser?
Thanks for your cooperation in advance.