I have the same issue I am unable to install to the new iPad 11
my iPhone is currently on iOS 12.1.2 , the new iPad is 12.1.1 so I am unable to install as the software release doesn’t match and there is no 12.1.2. For the iPad
to make things worse the iPad new gen has dumped the old reliable usb version of the connection leads and moved on to the C type connection both ends so I am unable to connect to any pc to do an I tunes install
technical told me to buy a new lead to do the install that possibly work ???
so currently I have a chopping board not a iPad new generation and I am starting to regret the decision