How do i get an app from iTouch to IPhone?

I have an old iTouch with an old game that i want to transfer to my iPhone 5s as it is not available anymore on app store. I'm pretty sure i had done it before by somehow getting app onto iTunes on my computer then putting on iphone but i don't know how to do it anymore. Any ideas?

I heared some tool call data transfer has similar features, maybe you can have a try

Depending on if the game is 32-bit or 64-bit it would not be able to work on the 5s as Apple only allows for 64-bit apps now.

You could check for it by signing into your Apple ID on the iPhone & checking your purchased section.

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