I am interested in this topic too. I have an iPad Air2 and would like to know if this is at all possible.
If it does not belong anywhere else and has to do with iPad post it here.
Yes.. you can install them via a process known as "sideloading"... using a program called Cydia Impactor. HOWEVER - if you do not have a $99 developer account with Apple, these apps will expire after 7 days (Apple currently offers a free 7 day developer account) and you'll need to sideload them all over again. Good luck!