I have an app from the app store that is no longer available. Can I find the app file on my phone, transfer it to my computer, then sideload (if that's the right term) it to my new phone. It was a free app that's work related. - the specifics really doesn't matter, though it's no secret. It's called XR-Express.
Update: I think I found a website that has the apk. Can I just download it to my PC then just email it to myself and open it on my phone? Though I'd still like to know if I can get the file off my old phone.