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If you aren't looking for a cracked app but simply need to install a specific version of djay Pro (perhaps an older legacy version) onto a device, you can use a method called Sideloading.
This requires a legitimate .ipa file and a Mac/PC. i djay pro ipa link
The Catch: A free Apple ID only lets the app work for 7 days. After that, you have to connect your device to your computer and re-sign it again. This is tedious for a working DJ.
In the world of Apple, .ipa stands for iOS App Store Package. Think of it like a .exe file for Windows or a .dmg file for Macs. It is the raw archive file that contains the application. The Catch: A free Apple ID only lets
Technically, when you download an app from the App Store, you are downloading an .ipa file, but Apple wraps it in a layer of encryption and DRM (Digital Rights Management) tied specifically to your Apple ID.
Sideloading is not illegal—piracy is. If you actually own a license for Djay Pro (say, you bought the Mac version) and want to install a specific older version on your iPad, you can legally use an IPA. Again, searching for a generic "i djay pro
Step-by-step with AltStore (For Developers & Legit Users):
Again, searching for a generic "i djay pro ipa link" is not legal because you do not own the license.