Hi JayZen,
Thanks for your message.
Cubasis 2 has been tested on iOS 9 and should not crash on startup.
Also it is not required to delete previous versions before installing an app update normally.
Following Andy’s suggestion it is always strongly recommended to backup projects and other data on a regular basis via the available options such as FileSharing, WiFi Server etc. (please learn more about this in the MediaBay chapter of the in-app help).
Please give it a try to shut down the iPad and restart, to see if Cubasis 2 can be launched as expected.
If launching the app still fails, please come up with a separate topic, so we’re able to support you.
Hope that helps.
Thanks,
Lars