I have a very easy question for you. I have an ipa file from a custumor and I would like to install it. I have an iPad 4. Gen with iOS 10 and an iPhone 5s with iOS 11. I have no mac, windows 10 only. In the past it was possible to install it via Itunes on the PC but it seems to be not possible any more. Can some one give me some help to install the file?