No, I have not connected my phone to iTunes for years so I don't believe that I have the app file anywhere other than my phone.
On the apple website when I was looking at iTunes version I did try to install an Itunes64. Is that the same one? If not then why doesn't apple list it on their website since many people would want the itunes that store their apps on it.
When I did try to install the Itunes64 from the website previously I got error message "Service "ipod service" (ipod service) failed to start. Verify that you have sufficient privileges to start system services". This is my personal Windows 10 computer so I'm not sure why it would day that, I don't believe that I have any antivirus blocking that either.
I just need to get 1 old app that's not on the app store from 1 phone to the other the other. Is there any other way that I can do that if itunes does not work?