Visit the nostr:nprofile1qqs83nn04fezvsu89p8xg7axjwye2u67errat3dx2um725fs7qnrqlgzqtdq0 profile and download the file listed in the profile Bio area. Then install the APK. You may have to enable third party app installs. You may get prompted to do this. Then you can install anything from this third party store built on Nostr.