To use a vintage IPA file like djay 2 v2.8.1 in the modern day, standard App Store downloading will not work because the app has been unlisted. Users typically rely on specific iOS deployment methods:
What and iOS version are you planning to use? djay 2 for iPhone IPA v2.8.1
An is the iOS app package format. Users typically look for the v2.8.1 IPA for several specific reasons: To use a vintage IPA file like djay 2 v2