Unable to install app on new phone because "App is no longer available in the App Store" I switched to an iPhone 8 Plus and found out that 2 paid apps cannot be downloaded anymore as they have been removed from the store.

I have copies of the app on several devices - the oldest device that still has this app is an iPhone 4.

I am having trouble transferring the app to my computer so that I can manually transfer it to my new device. Is there any way at all?

I've tried a few online suggestions but none works i.e. Transfer purchases, downgrade to iTunes 12 etc.

I paid for these 2 apps and would really appreciate help in getting them transferred over to my new device. Reaching out to the developer is not an option.
If the app is 32-bit it will not work on iOS 11.

If it is 64-bit but not in the AppStore you can: 


Find an .ipa file of the app and sideload it with Cydia Impactor
Jailbreak both your iPhone 8 and 4. Then you can dump the .ipa file from your iPhone 4 (using something like iFunbox) and install it on your iPhone 8 (also using something like iFunbox or Cydia Impactor).


Note: Jailbreaking voids your warranty.