Hi. I would just like to chime in and say that I have been doing some experimentation with Cydia impactor along with Zarvox, and it's not that you need it if you are running IOS 11 or 12, you will need it for any IOS version. Also, Zarvox may still be under the impression that Cidia impactor is capable of signing 32bit apps for 64bit devices, unfortunately that is not the case. Audio Defense, being the IPA that we did have at the time, seams to be 64bit compatible, so it installed fine, but later I tried installing some other apps and all of them complained about some kind of binaries, wich have to do with 32bit vs 64bit apps. So bottom line, yes, you can install IPA apps using Cidia impactor, but you can only install apps capable of running on your device, and if it's a 32 bit app, IOS11 or 12 won't accept it at all. I just wanted to make that clear to anyone who wanted to know.